Mehmet mendeş - Academia.edu (original) (raw)
Papers by Mehmet mendeş
SLOVENIAN VETERINARY RESEARCH
This study was carried out to investigate the effects of selection on the single nucleotide polym... more This study was carried out to investigate the effects of selection on the single nucleotide polymorphisms (SNPs) in coding sequence of leptin receptor (LEPR) gene and possible associations between SNPs' and some meat yield traits of Japanese quail lines. Fifteen generations divergently selected two lines (HBW and LBW) for 5-weeks of age body weight and a control were used as materials for this study. A 348-bp part of the LEPR coding region (18 th exon) were sequenced in a total of 113 individuals from the three quail lines and shown that the fragments contained four SNPs loci (T490C, C528T, G537A, T571C) and five haplotypes (TTGT, CTGT, TCGT, TCAT, TCAC). T490C replacement caused the missense mutation of phenylalanine to convert to leucine (Phe>Leu). However, other SNPs were synonymous and there were no changes in transcripts. It was determined that the quails with higher phenotypic values were in the TT genotype at the T390C locus. Statistical analyses showed that there were significant differences among the quail lines, SNP alleles and haplotypes in terms of interested phenotypic traits (P<0.05), and also SNP and haplotype distributions changed depending on quail lines (P<0.001). When all results were evaluated together, it was concluded that the fifteen generations of selection caused significant changes in the LEPR gene in terms of economically important traits in Japanese quail lines (C. coturnix japonica).
Tarim Bilimleri Dergisi-journal of Agricultural Sciences, 2005
In animal breeding and genetics, knowledge of causal effects may provide valuable information on ... more In animal breeding and genetics, knowledge of causal effects may provide valuable information on selection. Different contributions of explanatory variables to the traits indicate that the breeder has to choose the variable with the largest contribution in a selection effort. In this study, direct and indirect effects of four explanatory variables (Shank Length, Breast Length, Breast Depth and Breast Circumference) influential on live weight at week 30 in American Bronze turkeys were investigated using path analysis. Results of the analyses indicated that the direct effects of shank length were the largest on live weight. In general, indirect effects of Breast Length and Breast Circumference through Shank Length were highest among all indirect effects. Shank Length is the most influential variable and must be included in the model in estimating the live weight at week 30.
Water, comprising 60-85% of bird body weight, is found in all tissues and cells. It takes a role ... more Water, comprising 60-85% of bird body weight, is found in all tissues and cells. It takes a role in many important metabolic events, such as regulation of body temperature, digestion, translocation and absorption of feeds, hydrolysis of protein, fat and carbohydrates, sight and hearing functions, respiration and perspiration (DEGEN et al., 1991; TESTIK and ÇELEN, 1996; KARABAYİR, 2001). The quality of drinking water is described by its physical, chemical, and microbial characteristics. Among these quality criteria, level of dissolved oxygen is also important along with pH and temperature. Oxygen enriched water was reported to enhance feed conversion and thereby increase growth performance in broilers (ZIMMERMAN et al., 1991). BARTON et al., (1986) found a positive correlation between dissolved oxygen level and body weight after evaluating 300 commercial broiler farms. From this point, it may be expect that differences in the dissolved oxygen level in drinking water may affect two im...
Bu calismada, normallik ve varyanslarin homojenligi on sartlarinin saglanmadigi durumlarda varyan... more Bu calismada, normallik ve varyanslarin homojenligi on sartlarinin saglanmadigi durumlarda varyans analizi teknigine alternatif olarak kullanilan uc testin (Welch test, James second-order test, and Alexander and Govern test) guc degerleri icin guven araliklari olusturulmustur. Yapilan 50,000 simulasyon denemesi sonucunda varyanslarin homojenligi on sartinin yerine gelmemesi durumunda testin gucunun dustugu ve guven araliginin daha genisledigi gorulmustur. Diger taraftan, ornek hacmi ve ortalamalar arasi standardize edilmis farkin (o) artmasi durumunda guven araligi daralmaktadir. Bu durum, ornek hacmi 50 ve ortalamalar arasi fark 1 standart sapma iken daha belirgindir. Ornek hacminin kucuk, ortalamalar arasi farkin ise kucuk veya orta duzeyde (o=0.50 o=0.75) olmasi durumunda testin gucu icin guven araliginin olusturulmasi, sadece alt ya da ust sinirinin verilmesinden cok daha bilgilendirici olmaktadir. Diger taraftan, ornek hacmi ve ortalamalar arasi farkin buyuk oldugu durumlarda t...
Research on the characteristics of livestock growth provides useful and practical information for... more Research on the characteristics of livestock growth provides useful and practical information for breeding purposes (AKBAŞ, 1996; MARUYAMA et al., 1998; LAWRENCE and FOWLER, 2002; LANDGRAFT et al., 2002; AGGREY, 2004). Two important parameters of growth are the genetic potential for growth and the time to reach maturity. When animal growth is described by a growth curve, these parameters can be presented as biologically interpretable constants in a mathematical equation. Classical growth models such as Gompertz, Logistic, von Bertalanffy and Richard’s equations are still widely and frequently used to describe various biological processes (WERKER and JAGGARD, 1997; BIRCH, 1999; FEKEDULEGN et al., 1999; ERSOY et al., 2006). Determination of various growth parameters (weight at different ages, daily weight gain, rate of maturity, time of inflection or the point on the growth curve when the rate of growth is maximal and weight at inflection) are quite important for selection of animals ...
Archiv Fur Geflugelkunde, 2010
Intraspecific egg composition may vary depending upon the size of the egg (RICKLEFS, 1984; ALISAU... more Intraspecific egg composition may vary depending upon the size of the egg (RICKLEFS, 1984; ALISAUSKAS, 1986; HEPP et al., 1987; HILL, 1988; ARNOLD et al., 1991). Statistical techniques derived from allometry are used to examine the relationships between egg size and egg composition (REISS, 1989). Typically, the log of egg component mass, such as wet albumen, is regressed on the log of egg mass (log[y] = log[a] + b log[x]). The slopes of these functions depict the rate at which the egg component varies with egg size. When the slope of a log-log function is equal to 1.0 (isometry), the percentage of egg component remains constant across different sizes of eggs. Slopes greater than 1.0 (positive allometry) indicate that the component mass increases disproportionately by rising egg mass. Accordingly, large eggs proportionately contain more component mass than small ones. Contrary, slopes less than 1.0 (negative allometry) demonstrate that components increase proportionately less than eg...
• It is very important to report some effect size measures that will show if the observed differe... more • It is very important to report some effect size measures that will show if the observed differences among the groups are also of practical significance along with statistical significance while reporting statistical analysis results. Performances of four commonly used effect size measures (Eta-Squared, Partial Eta Squared, Omega Squared and Epsilon Squared) were compared for one and two-way ANOVA models under 3000 different conditions. Results of simulation runs showed that the Epsilon and Omega-Squared estimates were quite unbiased when compared to Eta and Partial Eta-Squared which are directly reported by commonly used statistical packages while reporting ANOVA results. Thus, it could be concluded that reporting Epsilon or Omega-Squared is more appropriate to evaluate the practical significance of observed differences along with P-values.
Acta medica Okayama, 2005
We used a regression tree method (RTM) to determine risks of depression in children/adolescents. ... more We used a regression tree method (RTM) to determine risks of depression in children/adolescents. The survey records of 4,143 children/adolescents in a study based in Mersin, Turkey served as data in this study, and multi-step, stratified, and cluster sampling were used. Effects of 24 variables (sex, smoking, parental problems, etc.) were evaluated on depression scores. The Child Beck Depression Inventory (CBDI) was used to determine the level of depression. Subjects were into 12 different groups based on magnitudes of mean depression scores. The interactions among 7 variables determined to be risk factors are shown on a schema. The STATISTICA (ver.6.0) package program was used for all computations. Although traditional statistical methods have often been used for analysis in this field, such approaches are associated with certain disadvantages such as missing values, ignorance of interaction effects, or restriction of the shape of the distribution. To avoid such disadvantages, we th...
Journal of Animal and Plant Sciences, 2013
The main objective of this study was to investigate the effect of t wo different stocking densiti... more The main objective of this study was to investigate the effect of t wo different stocking densities (11 birds / m 2 and 17 birds / m 2 ) on deviation from bilateral symmetry in broiler chickens. For this purpose, the weekly body weight, left and right shank length, shank width, wing length, face width and face length of the same birds were measured on from 7 th to 42 nd days of age. Repeated measurements analysis of variance was used to investigate the effect of stocking densities and ages (week) on relative asymmetry. Binary logistic regression analysis was used to determine the most important morphological character influencing the deviation from ideal slaughter weight of 1800 g. The overall relative asymmetry mean for shank width was significantly greater in control group (2.42±0.41) than in treatment group (1.87±0.43). The results of binary logisti c regression analysis showed that only increase in difference of width in left and right shank caused significant change (p=0.0148) ...
Turkiye Klinikleri Journal of Sports Sciences, 2020
Sporcuların başarısını etkileyen, önemli unsurlardan biri kas kuvvetidir. 1,2 Birçok spor dalında... more Sporcuların başarısını etkileyen, önemli unsurlardan biri kas kuvvetidir. 1,2 Birçok spor dalında olduğu gibi futbolda da sıçrama, şut atmak, ani dönüşler, sprint ve ani çıkışların yapıldığı anda özel-likle alt ekstremitelere büyük bir yük binmektedir. Bu nedenle sporcunun daha iyi performans gösterebilmesi için yeterli ve dengeli bir kuvvete sahip olması gerekir. 1,3 Kas kuvvetinin artışına bağlı olarak, kısa
Archives Animal Breeding, 2010
The main objective of this study was to predict mono and multiphasic growth model parameters of b... more The main objective of this study was to predict mono and multiphasic growth model parameters of broilers. For this purpose daily body weights-age data of 106 male and female chickens reared under different stocking densities (GR1=11 birds/m 2 , GR2=17 birds/m 2 and GR3=25 birds/m 2) were used. Results of mono and multiphasic (diphasic and triphasic) growth curve analyses showed that defining the growth of birds using multiphasic growth models instead of monophasic growth models, displays more detailed and reliable results. Based on goodness-of-fit criteria, lead to the choice of a triphasic logistic growth function for GR1 and GR2, and diphasic function for GR3 males and females.
Archives Animal Breeding, 2008
The purpose of this study is to investigate the effect of different feeding programs such as ad l... more The purpose of this study is to investigate the effect of different feeding programs such as ad libitum feeding (AD), 20 % feed restriction based on ad libitum group (FR1) and not fed between 9 a.m. and 3 p.m. (FR2) on deviation from bilateral symmetry or developmental stability in broiler chickens by means of two different approaches namely asymmetry measures and allometric growth model parameters. The weekly left and right sides of shank length, shank width, wing length and face width of chickens were collected from 7 days of age to 42 days of age. Results of this study showed that the deviations from the bilateral symmetry were mostly in fluctuating asymmetry (FA) in the FR1 group birds. On the other hand, the deviations from the bilateral symmetry in the birds in group AD and FR2 were mostly in the form of anti-symmetry (AS) and directional asymmetry (DA) respectively. In this study, the deviation from the bilateral symmetry was mostly in FA type for the measured morphological characters for the FR1 group, and the FA level was usually lower indicating higher welfare level and lower developmental instability for these animals than that of the AD and FR2 groups. Allometric growth coefficients for evaluating the effects of the feeding programs on the developmental stability were a little bit different from the findings obtained by the asymmetry measures' being taken into account. Allometric growth parameters, therefore, should be taken into consideration, along with asymmetry measures when investigating effect of rearing conditions or environmental conditions on developmental stability. As a conclusion, intensive feeding (AD) and long-term feed restriction (FR2) can be said as an important environmental factor affecting developmental stability and dependently the animal welfare and performance.
Archives Animal Breeding, 2005
Sixteen kids were assigned at an average of 6 weeks of age to two treatments: control with no sup... more Sixteen kids were assigned at an average of 6 weeks of age to two treatments: control with no supplementation and 5 g/kid of probiotic supplementation daily. The probiotic was resuspended in distilled water and given orally every day in the morning throughout a 42 d study. Grower concentrate, vetch hay and water were offered ad libitum throughout the study. Kids were abruptly weaned 14 days after the initiation of the study and received only grower concentrate, vetch hay and water ad libitum from d 15 to 42. The supplementation of probiotic did not result in any significant differences in weight gain, nutrient intake, feed efficiency and diarrhea score in kids. However a positive trend toward improved weight gain, feed intake and feed efficiency in kids supplemented with probiotic suggested that probiotic might improve growth and performance of kids and are worth further investigation.
Archives Animal Breeding, 2005
This study aimed to investigate the relations among the pre-and post-slaughter traits of American... more This study aimed to investigate the relations among the pre-and post-slaughter traits of American bronze turkeys. Birds were raised under three different lighting regimes. Pre-slaughter traits were measured when the birds were 15-, 20-, and 30-weeks of age. Canonical correlation analysis showed that as the birds aged the relations among the pre-and post-slaughter characters became more pronounced. Coefficients of determination (R 2) were 63.6-82.8% when pre-slaughter characteristics were measured at the 15 th week, 84.8-94.6% at the 20 th week, and 91.3-99.1% at the 30 th week, respectively.
Archives Animal Breeding, 2007
The purpose of this study is to investigate the effect of different feed restrictions which were ... more The purpose of this study is to investigate the effect of different feed restrictions which were applied in early period on change of Body Mass Index of Ross 308 broiler chickens. For this aim we used to two different statistical methods, namely Profile analysis and Growth curves. The daily body weight and weekly body length change of chickens was collected from 7 days of age to 42 days of age. Profile analysis was used to compare differences among the groups and the Gompertz growth function was regressed from these data to estimate the growth parameters. The group profiles were not found parallel in terms of Body Mass Index (P<0.001) as a result of the Profile analysis. Therefore once concludes that the difference in Body Mass Index (BMI) of the animals between weeks depends on feeding regime (profiles are not parallel). The value of A and b parameter values were 0.02368 and 0.83436 for ad libitum group (AD), 0.02216 and 0.75251 for 20 % feed restriction based on ad libitum grou...
Archives Animal Breeding, 2006
The purpose of this study was to establish the growth curves parameters of American Bronze turkey... more The purpose of this study was to establish the growth curves parameters of American Bronze turkeys. The weekly body weight changes of male and female turkeys were recorded during 11 to 24 weeks of age. The Richards' growth model fitted the turkey weight and age (week) data. Profile analysis was also applied to weight-age data in order to get more detailed information about the differences in the live weights of male and female turkeys in consecutive weeks. Estimates for mature body weight were found as 9720.40 ± 971.33 g and higher for males than for females as 6029.96 ± 316.55 g. Based on Richards' model, male turkeys matured more slowly and it was needed that a more time to reach mature body weight than female turkeys. Results of profile analysis supported those results. Estimates for the absolute growth rate, absolute maturing rate and relative growth rate values were higher for females when compared to males. Male turkeys reached the maximum growth rate at 16.30 weeks of age whereas female ones reached the maximum growth rate at 12.85 weeks of age. Live weights of male and female turkeys, when both reached the maximum growth rate, were 3475.61 g and 2156.06 g, respectively. Male turkeys reached 80 % of their mature weights at 24 weeks of age, whereas female ones reached 92% of their mature weight.
Bitlis Eren Üniversitesi Fen Bilimleri Dergisi, 2018
Bu çalışma fındık kabuklarından elde edilen odun sirkesi'nin, in-vitro şartlarında Aspergillus ni... more Bu çalışma fındık kabuklarından elde edilen odun sirkesi'nin, in-vitro şartlarında Aspergillus niger ve Penicillium digitatum'a karşı antifungal etkisini saptamak amacıyla yapılmıştır. Odun sirkesi'nin %1, %3, %5, %7 ve %10 mL'lik konsantrasyonlarının dâhil edildiği Patates Dekstroz Agar (PDA)'a, mikrofungusların 5 mm çapındaki miselyum diskleri inoküle edildikten sonra 24±1 oC'de 7 gün boyunca inkübasyona bırakılmıştır. İnkübasyonun sonunda mikrofungusların koloni çapları ölçülmüş ve kontrollere göre odun sirkesinin % engelleme oranları hesaplanmıştır. Yapılan varyans analizi sonucunda dikkate alınan uygulamalar arasında istatistiksel olarak önemli farkların bulunduğu görülmüştür (P=0.000). Varyans analizi sonucunda uygulanan Dunnett testi sonucunda ise kontrol grubu ile %1 mL odun sirkesi hariç, odun sirkesinin diğer dozları arasında istatistiksel olarak önemli farkların bulunduğu görülmüştür. Sonuç olarak; odun sirkesinin küf mantarlarını engellemede kullanılabileceği sonucuna varılmıştır.
Turkiye Klinikleri Journal of Biostatistics, 2017
ORİJİNAL ARAŞTIRMA ORIGINAL RESEARCH n the last decade, researchers are commonly interested in st... more ORİJİNAL ARAŞTIRMA ORIGINAL RESEARCH n the last decade, researchers are commonly interested in studying gene expression level changes through time and in evaluating trend differences between the various experimental groups and conditions. 1-4 The main purpose of time-course microarray experiments is to describe the changes in expression levels of genes over time and compare the pattern of that change across genes, tissue types, or experimental conditions. 1,4-12 I
British Journal of Applied Science & Technology, 2016
In this study, suitable number of permutations were tried to be determined empirically for permut... more In this study, suitable number of permutations were tried to be determined empirically for permutation test, one of which alternatively used in analysis of variance (ANOVA). Random numbers were generated from (3) χ 2 distribution by simulation technique, and type I error rates were calculated with their standard errors. For k=2, 3 and 4, data were dealt with what is commonly faced in practice. Number of observation (n) in each group were taken to be 5, 10 and 15 (except for k = 2). Number of permutation changes with respect to k and n. For k=2, 3 and 4, required number of permutation was determined to be 15,000, 25,000 and 30,000 respectively. In general, there is great advantage of not allowing number of permutation under 10,000, if permutation tests are to be used in testing significance of differences of means of groups.
SLOVENIAN VETERINARY RESEARCH
This study was carried out to investigate the effects of selection on the single nucleotide polym... more This study was carried out to investigate the effects of selection on the single nucleotide polymorphisms (SNPs) in coding sequence of leptin receptor (LEPR) gene and possible associations between SNPs' and some meat yield traits of Japanese quail lines. Fifteen generations divergently selected two lines (HBW and LBW) for 5-weeks of age body weight and a control were used as materials for this study. A 348-bp part of the LEPR coding region (18 th exon) were sequenced in a total of 113 individuals from the three quail lines and shown that the fragments contained four SNPs loci (T490C, C528T, G537A, T571C) and five haplotypes (TTGT, CTGT, TCGT, TCAT, TCAC). T490C replacement caused the missense mutation of phenylalanine to convert to leucine (Phe>Leu). However, other SNPs were synonymous and there were no changes in transcripts. It was determined that the quails with higher phenotypic values were in the TT genotype at the T390C locus. Statistical analyses showed that there were significant differences among the quail lines, SNP alleles and haplotypes in terms of interested phenotypic traits (P<0.05), and also SNP and haplotype distributions changed depending on quail lines (P<0.001). When all results were evaluated together, it was concluded that the fifteen generations of selection caused significant changes in the LEPR gene in terms of economically important traits in Japanese quail lines (C. coturnix japonica).
Tarim Bilimleri Dergisi-journal of Agricultural Sciences, 2005
In animal breeding and genetics, knowledge of causal effects may provide valuable information on ... more In animal breeding and genetics, knowledge of causal effects may provide valuable information on selection. Different contributions of explanatory variables to the traits indicate that the breeder has to choose the variable with the largest contribution in a selection effort. In this study, direct and indirect effects of four explanatory variables (Shank Length, Breast Length, Breast Depth and Breast Circumference) influential on live weight at week 30 in American Bronze turkeys were investigated using path analysis. Results of the analyses indicated that the direct effects of shank length were the largest on live weight. In general, indirect effects of Breast Length and Breast Circumference through Shank Length were highest among all indirect effects. Shank Length is the most influential variable and must be included in the model in estimating the live weight at week 30.
Water, comprising 60-85% of bird body weight, is found in all tissues and cells. It takes a role ... more Water, comprising 60-85% of bird body weight, is found in all tissues and cells. It takes a role in many important metabolic events, such as regulation of body temperature, digestion, translocation and absorption of feeds, hydrolysis of protein, fat and carbohydrates, sight and hearing functions, respiration and perspiration (DEGEN et al., 1991; TESTIK and ÇELEN, 1996; KARABAYİR, 2001). The quality of drinking water is described by its physical, chemical, and microbial characteristics. Among these quality criteria, level of dissolved oxygen is also important along with pH and temperature. Oxygen enriched water was reported to enhance feed conversion and thereby increase growth performance in broilers (ZIMMERMAN et al., 1991). BARTON et al., (1986) found a positive correlation between dissolved oxygen level and body weight after evaluating 300 commercial broiler farms. From this point, it may be expect that differences in the dissolved oxygen level in drinking water may affect two im...
Bu calismada, normallik ve varyanslarin homojenligi on sartlarinin saglanmadigi durumlarda varyan... more Bu calismada, normallik ve varyanslarin homojenligi on sartlarinin saglanmadigi durumlarda varyans analizi teknigine alternatif olarak kullanilan uc testin (Welch test, James second-order test, and Alexander and Govern test) guc degerleri icin guven araliklari olusturulmustur. Yapilan 50,000 simulasyon denemesi sonucunda varyanslarin homojenligi on sartinin yerine gelmemesi durumunda testin gucunun dustugu ve guven araliginin daha genisledigi gorulmustur. Diger taraftan, ornek hacmi ve ortalamalar arasi standardize edilmis farkin (o) artmasi durumunda guven araligi daralmaktadir. Bu durum, ornek hacmi 50 ve ortalamalar arasi fark 1 standart sapma iken daha belirgindir. Ornek hacminin kucuk, ortalamalar arasi farkin ise kucuk veya orta duzeyde (o=0.50 o=0.75) olmasi durumunda testin gucu icin guven araliginin olusturulmasi, sadece alt ya da ust sinirinin verilmesinden cok daha bilgilendirici olmaktadir. Diger taraftan, ornek hacmi ve ortalamalar arasi farkin buyuk oldugu durumlarda t...
Research on the characteristics of livestock growth provides useful and practical information for... more Research on the characteristics of livestock growth provides useful and practical information for breeding purposes (AKBAŞ, 1996; MARUYAMA et al., 1998; LAWRENCE and FOWLER, 2002; LANDGRAFT et al., 2002; AGGREY, 2004). Two important parameters of growth are the genetic potential for growth and the time to reach maturity. When animal growth is described by a growth curve, these parameters can be presented as biologically interpretable constants in a mathematical equation. Classical growth models such as Gompertz, Logistic, von Bertalanffy and Richard’s equations are still widely and frequently used to describe various biological processes (WERKER and JAGGARD, 1997; BIRCH, 1999; FEKEDULEGN et al., 1999; ERSOY et al., 2006). Determination of various growth parameters (weight at different ages, daily weight gain, rate of maturity, time of inflection or the point on the growth curve when the rate of growth is maximal and weight at inflection) are quite important for selection of animals ...
Archiv Fur Geflugelkunde, 2010
Intraspecific egg composition may vary depending upon the size of the egg (RICKLEFS, 1984; ALISAU... more Intraspecific egg composition may vary depending upon the size of the egg (RICKLEFS, 1984; ALISAUSKAS, 1986; HEPP et al., 1987; HILL, 1988; ARNOLD et al., 1991). Statistical techniques derived from allometry are used to examine the relationships between egg size and egg composition (REISS, 1989). Typically, the log of egg component mass, such as wet albumen, is regressed on the log of egg mass (log[y] = log[a] + b log[x]). The slopes of these functions depict the rate at which the egg component varies with egg size. When the slope of a log-log function is equal to 1.0 (isometry), the percentage of egg component remains constant across different sizes of eggs. Slopes greater than 1.0 (positive allometry) indicate that the component mass increases disproportionately by rising egg mass. Accordingly, large eggs proportionately contain more component mass than small ones. Contrary, slopes less than 1.0 (negative allometry) demonstrate that components increase proportionately less than eg...
• It is very important to report some effect size measures that will show if the observed differe... more • It is very important to report some effect size measures that will show if the observed differences among the groups are also of practical significance along with statistical significance while reporting statistical analysis results. Performances of four commonly used effect size measures (Eta-Squared, Partial Eta Squared, Omega Squared and Epsilon Squared) were compared for one and two-way ANOVA models under 3000 different conditions. Results of simulation runs showed that the Epsilon and Omega-Squared estimates were quite unbiased when compared to Eta and Partial Eta-Squared which are directly reported by commonly used statistical packages while reporting ANOVA results. Thus, it could be concluded that reporting Epsilon or Omega-Squared is more appropriate to evaluate the practical significance of observed differences along with P-values.
Acta medica Okayama, 2005
We used a regression tree method (RTM) to determine risks of depression in children/adolescents. ... more We used a regression tree method (RTM) to determine risks of depression in children/adolescents. The survey records of 4,143 children/adolescents in a study based in Mersin, Turkey served as data in this study, and multi-step, stratified, and cluster sampling were used. Effects of 24 variables (sex, smoking, parental problems, etc.) were evaluated on depression scores. The Child Beck Depression Inventory (CBDI) was used to determine the level of depression. Subjects were into 12 different groups based on magnitudes of mean depression scores. The interactions among 7 variables determined to be risk factors are shown on a schema. The STATISTICA (ver.6.0) package program was used for all computations. Although traditional statistical methods have often been used for analysis in this field, such approaches are associated with certain disadvantages such as missing values, ignorance of interaction effects, or restriction of the shape of the distribution. To avoid such disadvantages, we th...
Journal of Animal and Plant Sciences, 2013
The main objective of this study was to investigate the effect of t wo different stocking densiti... more The main objective of this study was to investigate the effect of t wo different stocking densities (11 birds / m 2 and 17 birds / m 2 ) on deviation from bilateral symmetry in broiler chickens. For this purpose, the weekly body weight, left and right shank length, shank width, wing length, face width and face length of the same birds were measured on from 7 th to 42 nd days of age. Repeated measurements analysis of variance was used to investigate the effect of stocking densities and ages (week) on relative asymmetry. Binary logistic regression analysis was used to determine the most important morphological character influencing the deviation from ideal slaughter weight of 1800 g. The overall relative asymmetry mean for shank width was significantly greater in control group (2.42±0.41) than in treatment group (1.87±0.43). The results of binary logisti c regression analysis showed that only increase in difference of width in left and right shank caused significant change (p=0.0148) ...
Turkiye Klinikleri Journal of Sports Sciences, 2020
Sporcuların başarısını etkileyen, önemli unsurlardan biri kas kuvvetidir. 1,2 Birçok spor dalında... more Sporcuların başarısını etkileyen, önemli unsurlardan biri kas kuvvetidir. 1,2 Birçok spor dalında olduğu gibi futbolda da sıçrama, şut atmak, ani dönüşler, sprint ve ani çıkışların yapıldığı anda özel-likle alt ekstremitelere büyük bir yük binmektedir. Bu nedenle sporcunun daha iyi performans gösterebilmesi için yeterli ve dengeli bir kuvvete sahip olması gerekir. 1,3 Kas kuvvetinin artışına bağlı olarak, kısa
Archives Animal Breeding, 2010
The main objective of this study was to predict mono and multiphasic growth model parameters of b... more The main objective of this study was to predict mono and multiphasic growth model parameters of broilers. For this purpose daily body weights-age data of 106 male and female chickens reared under different stocking densities (GR1=11 birds/m 2 , GR2=17 birds/m 2 and GR3=25 birds/m 2) were used. Results of mono and multiphasic (diphasic and triphasic) growth curve analyses showed that defining the growth of birds using multiphasic growth models instead of monophasic growth models, displays more detailed and reliable results. Based on goodness-of-fit criteria, lead to the choice of a triphasic logistic growth function for GR1 and GR2, and diphasic function for GR3 males and females.
Archives Animal Breeding, 2008
The purpose of this study is to investigate the effect of different feeding programs such as ad l... more The purpose of this study is to investigate the effect of different feeding programs such as ad libitum feeding (AD), 20 % feed restriction based on ad libitum group (FR1) and not fed between 9 a.m. and 3 p.m. (FR2) on deviation from bilateral symmetry or developmental stability in broiler chickens by means of two different approaches namely asymmetry measures and allometric growth model parameters. The weekly left and right sides of shank length, shank width, wing length and face width of chickens were collected from 7 days of age to 42 days of age. Results of this study showed that the deviations from the bilateral symmetry were mostly in fluctuating asymmetry (FA) in the FR1 group birds. On the other hand, the deviations from the bilateral symmetry in the birds in group AD and FR2 were mostly in the form of anti-symmetry (AS) and directional asymmetry (DA) respectively. In this study, the deviation from the bilateral symmetry was mostly in FA type for the measured morphological characters for the FR1 group, and the FA level was usually lower indicating higher welfare level and lower developmental instability for these animals than that of the AD and FR2 groups. Allometric growth coefficients for evaluating the effects of the feeding programs on the developmental stability were a little bit different from the findings obtained by the asymmetry measures' being taken into account. Allometric growth parameters, therefore, should be taken into consideration, along with asymmetry measures when investigating effect of rearing conditions or environmental conditions on developmental stability. As a conclusion, intensive feeding (AD) and long-term feed restriction (FR2) can be said as an important environmental factor affecting developmental stability and dependently the animal welfare and performance.
Archives Animal Breeding, 2005
Sixteen kids were assigned at an average of 6 weeks of age to two treatments: control with no sup... more Sixteen kids were assigned at an average of 6 weeks of age to two treatments: control with no supplementation and 5 g/kid of probiotic supplementation daily. The probiotic was resuspended in distilled water and given orally every day in the morning throughout a 42 d study. Grower concentrate, vetch hay and water were offered ad libitum throughout the study. Kids were abruptly weaned 14 days after the initiation of the study and received only grower concentrate, vetch hay and water ad libitum from d 15 to 42. The supplementation of probiotic did not result in any significant differences in weight gain, nutrient intake, feed efficiency and diarrhea score in kids. However a positive trend toward improved weight gain, feed intake and feed efficiency in kids supplemented with probiotic suggested that probiotic might improve growth and performance of kids and are worth further investigation.
Archives Animal Breeding, 2005
This study aimed to investigate the relations among the pre-and post-slaughter traits of American... more This study aimed to investigate the relations among the pre-and post-slaughter traits of American bronze turkeys. Birds were raised under three different lighting regimes. Pre-slaughter traits were measured when the birds were 15-, 20-, and 30-weeks of age. Canonical correlation analysis showed that as the birds aged the relations among the pre-and post-slaughter characters became more pronounced. Coefficients of determination (R 2) were 63.6-82.8% when pre-slaughter characteristics were measured at the 15 th week, 84.8-94.6% at the 20 th week, and 91.3-99.1% at the 30 th week, respectively.
Archives Animal Breeding, 2007
The purpose of this study is to investigate the effect of different feed restrictions which were ... more The purpose of this study is to investigate the effect of different feed restrictions which were applied in early period on change of Body Mass Index of Ross 308 broiler chickens. For this aim we used to two different statistical methods, namely Profile analysis and Growth curves. The daily body weight and weekly body length change of chickens was collected from 7 days of age to 42 days of age. Profile analysis was used to compare differences among the groups and the Gompertz growth function was regressed from these data to estimate the growth parameters. The group profiles were not found parallel in terms of Body Mass Index (P<0.001) as a result of the Profile analysis. Therefore once concludes that the difference in Body Mass Index (BMI) of the animals between weeks depends on feeding regime (profiles are not parallel). The value of A and b parameter values were 0.02368 and 0.83436 for ad libitum group (AD), 0.02216 and 0.75251 for 20 % feed restriction based on ad libitum grou...
Archives Animal Breeding, 2006
The purpose of this study was to establish the growth curves parameters of American Bronze turkey... more The purpose of this study was to establish the growth curves parameters of American Bronze turkeys. The weekly body weight changes of male and female turkeys were recorded during 11 to 24 weeks of age. The Richards' growth model fitted the turkey weight and age (week) data. Profile analysis was also applied to weight-age data in order to get more detailed information about the differences in the live weights of male and female turkeys in consecutive weeks. Estimates for mature body weight were found as 9720.40 ± 971.33 g and higher for males than for females as 6029.96 ± 316.55 g. Based on Richards' model, male turkeys matured more slowly and it was needed that a more time to reach mature body weight than female turkeys. Results of profile analysis supported those results. Estimates for the absolute growth rate, absolute maturing rate and relative growth rate values were higher for females when compared to males. Male turkeys reached the maximum growth rate at 16.30 weeks of age whereas female ones reached the maximum growth rate at 12.85 weeks of age. Live weights of male and female turkeys, when both reached the maximum growth rate, were 3475.61 g and 2156.06 g, respectively. Male turkeys reached 80 % of their mature weights at 24 weeks of age, whereas female ones reached 92% of their mature weight.
Bitlis Eren Üniversitesi Fen Bilimleri Dergisi, 2018
Bu çalışma fındık kabuklarından elde edilen odun sirkesi'nin, in-vitro şartlarında Aspergillus ni... more Bu çalışma fındık kabuklarından elde edilen odun sirkesi'nin, in-vitro şartlarında Aspergillus niger ve Penicillium digitatum'a karşı antifungal etkisini saptamak amacıyla yapılmıştır. Odun sirkesi'nin %1, %3, %5, %7 ve %10 mL'lik konsantrasyonlarının dâhil edildiği Patates Dekstroz Agar (PDA)'a, mikrofungusların 5 mm çapındaki miselyum diskleri inoküle edildikten sonra 24±1 oC'de 7 gün boyunca inkübasyona bırakılmıştır. İnkübasyonun sonunda mikrofungusların koloni çapları ölçülmüş ve kontrollere göre odun sirkesinin % engelleme oranları hesaplanmıştır. Yapılan varyans analizi sonucunda dikkate alınan uygulamalar arasında istatistiksel olarak önemli farkların bulunduğu görülmüştür (P=0.000). Varyans analizi sonucunda uygulanan Dunnett testi sonucunda ise kontrol grubu ile %1 mL odun sirkesi hariç, odun sirkesinin diğer dozları arasında istatistiksel olarak önemli farkların bulunduğu görülmüştür. Sonuç olarak; odun sirkesinin küf mantarlarını engellemede kullanılabileceği sonucuna varılmıştır.
Turkiye Klinikleri Journal of Biostatistics, 2017
ORİJİNAL ARAŞTIRMA ORIGINAL RESEARCH n the last decade, researchers are commonly interested in st... more ORİJİNAL ARAŞTIRMA ORIGINAL RESEARCH n the last decade, researchers are commonly interested in studying gene expression level changes through time and in evaluating trend differences between the various experimental groups and conditions. 1-4 The main purpose of time-course microarray experiments is to describe the changes in expression levels of genes over time and compare the pattern of that change across genes, tissue types, or experimental conditions. 1,4-12 I
British Journal of Applied Science & Technology, 2016
In this study, suitable number of permutations were tried to be determined empirically for permut... more In this study, suitable number of permutations were tried to be determined empirically for permutation test, one of which alternatively used in analysis of variance (ANOVA). Random numbers were generated from (3) χ 2 distribution by simulation technique, and type I error rates were calculated with their standard errors. For k=2, 3 and 4, data were dealt with what is commonly faced in practice. Number of observation (n) in each group were taken to be 5, 10 and 15 (except for k = 2). Number of permutation changes with respect to k and n. For k=2, 3 and 4, required number of permutation was determined to be 15,000, 25,000 and 30,000 respectively. In general, there is great advantage of not allowing number of permutation under 10,000, if permutation tests are to be used in testing significance of differences of means of groups.