Karayaka Kuzularında, Sütten Kesim Zamanında ve Doğumda Ölçülmüş Bazı Özellikler Arasındaki İlişkinin Tahmini İçin Kanonik Korelasyon Analizi (original) (raw)
Related papers
TURKISH JOURNAL OF VETERINARY AND ANIMAL SCIENCES, 2016
In the current paper the direct additive and maternal genetic effects on birth, weaning (at 90 days of age), and scanning (at 20 weeks of age) weights and muscle and fat depths of the ribeye area in Karayaka lambs were investigated. Analyses were carried out by the restricted maximum likelihood approach, fitting 6 animal models with various combinations of direct and maternal effects. The best model was chosen after testing for improvement in the log-likelihood values. Direct heritability (h 2 d) for all traits decreased when maternal genetic effects were included in the models. The maternal heritability (h 2 m) ranged from 0.15 to 0.22 for birth weight, from 0.04 to 0.14 for weaning weight, and from 0.08 to 0.16 for scanning weight. The effects of h 2 m on muscle depth and fat depth of the ribeye area were not considered due to their insignificance. The permanent environmental effect of the dam was significant for birth, weaning, and scanning weights. Moderate negative genetic correlations (r am) between the direct and maternal genetic effects were observed, which were significant for birth (-0.179 and-0.221), weaning (-0.310 and-0.415), and scanning (-0.116 and-0.141) weights. As a result, h 2 d and h 2 m can be used as selection criteria for birth, weaning, and scanning weights in Karayaka lambs.
Genetic trends of body weight and some scanning traits of Karayaka lambs
Indian Journal of Animal Research, 2018
This investigation was conducted to estimate the breeding values and genetic trends for body weight (BW), scanning fat depth (SFD) and scanning muscle depth (SMD) of Karayaka lambs (n= 1059) at 140 ± 3.36 day of age. Experiments were conducted in a nucleus flock of Karayaka sheep under a selective breeding program to increase productivity at research farm of Gaziosmanpasa University between the years 2006 - 2011. Breeding values were estimated with ASREML software. While genetic trend for BW and SMD showed a smooth ascending trend, SFD exhibited a descending trend throughout the experimental period. The genetic trend for BW, SFD and SMD of Karayaka lambs were observed as 0.433 kg / year, - 0.00686 mm / year and 0.00786 mm / year, respectively. The results showed that applying of a selection program on BW, SMD and SFD characteristics would increase BW and SMD values and decrease SFD value in Karayaka lambs.
Genetic Analysis of Pre-Weaning Growth Traits of Barki and Rahmani Lambs
Egyptian Journal of Animal Production, 2019
Data relevant to 704 Barki and 732 Rahmani lambs born at Alexandria University Experimental Station between 1991-2014 were utilized in this investigation to estimate genetic parameters, breeding values and genetic trends of birth weight (BW), weaning weight (WW) and average daily gain (ADG). The fixed effects of season and year of birth, sex of lamb, type of birth and parity on the considered traits were also studied. The least squares analysis with unequal subclass numbers showed that the overall means of BW, WW and ADG of Barki lambs were 3.69 kg, 20.53 kg and 139.7 g, respectively, the corresponding values for Rahmani lambs were 3.54 kg, 20.09 kg and 137.8 g, respectively. The analysis also indicated that fixed factors effects on all studied traits of both breeds were generally significant (P<0.01or P<0.05) except for the effects of year of birth on BW and parity on WW and ADG of Barki lambs were not significant. Genetic parameters and breeding values for the studied traits were estimated using the Wombat programme fitting Multiveriate Animal Models. Estimates of the direct heritability (h 2 a) were 0.186, 0.078 and 0.073 for BW, WW and ADG of Barki lambs, respectively. The corresponding values for Rahmani lambs were 0.285, 0.130 and 0.121, respectively. Estimates of the maternal heritability (h 2 m) were 0.121, 0.099 and 0.103 for BW, WW and ADG of Barki lambs, respectively. The respective values for Rahmani lambs were 0.097, 0.040 and 0.033, respectively. Estimates of the fraction of variance due to maternal permanent environmental effects (C 2) were 0.024, 0.022 and 0.016 for BW, WW and ADG of Barki lambs, respectively. The corresponding values for Rahmani lambs were 0.094, 0.039 and 0.033, respectively. Maternal effects were considerable portion of variation for early growth traits of both breeds. All correlations were positive and significant (P<0.01). The genetic corrletions were extermely high, being 0.993, 0.991 and 1.000 between BW and WW, between BW and ADG and between WW and ADG of Barki lambs, respectively. The corresponding values for Rahmani lambs were 0.685, 0.677 and 1.000. The maternal genetic correlations were high to extremely high being of 0.775, 0.753 and 0.999 between BW and WW, between BW and ADG and between WW and ADG of Barki lambs, respectively. The respective values for Rahmani lambs were 0.984, 0.988 and 1.000, respectively. The maternal permanent environmental correlations among growth traits of both breeds were extremely high ranged from 0.926 to 0.997. The phenotypic correlations were moderate since they varied from 0.395 to 0.479 between BW and each of WW and ADG of both breeds, and were extremely high being 0.994 and 0.996 between WW and ADG of Barki and Rahmani lambs, respectively. High and positive genetic correlations among lamb's growth traits of both breeds showed that improvement of one trait by selection would cause positive progress in the others. The breeding values for BW, WW and ADG of Barki rams ranged between-0.227 and 0.333 kg, between-1.666 and 2.444 kg and between-11.60 and 17.00 g, respectively. The corresponding values for Rahmani rams were between-0.475 and 0.241 kg, between-3.995 and 2.983 kg and between-27.21 and 20.57g. The genetic trends estimated by the regression of rams breeding values on time were positive but not significant for all traits of both breeds except for BW of Rahmani lambs which was significant (P<0.05). The results in general showed the need for designing an effective selection programme to improve growth traits of lambs of both breeds.
2011
Sahin, M., S. Cankaya and a. Ceyhan, 2011. Canonical correlation analysis for estimation of relationships between some traits measured at weaning time and six-month age in merino lambs. Bulg. J. Agric. Sci., 17: 680-686 in this study, canonical correlation analysis was applied to estimate the relationship between six different morphologic traits (X set – at weaning; height at withers (hW), chest depth (CD), chest width (CW), chest girth (CG) and rump width (CD)) measured at weaning and morphological traits of the six-month age (Y set – at sixmonth age; height at withers (hW_6), chest depth (CD_6), chest width (CW_6), chest girth (CG_6) and rump width (RW_6)) measured from 72 lambs of merino, at Marmara animal Breeding Research institute. First two of estimated six different canonical correlation coefficients (CCC) between the pairs of canonical variables were found significant (0.717, 0.587, P<0.05). The results obtained from canonical correlation analysis indicated that chest gi...
Relationship between birth weight and body growth characteristics of lambs
Biotehnologija u stocarstvu, 2014
Research was carried out in population of R2 generation Pirot pramenka x Pirot improved sheep during period of three years. Lambs were divided into three groups: I from 2.5 kg to 3.5 kg; II from 3.6 kg to 4.5 kg; III from 4.6 kg to 5.5 kg. Weight of lambs was controlled at birth, with 30, 60 and 90 days of age. Average body weight at birth of the tested lambs was 3.35 kg in the first group, 4.30 kg in the second group and 5.06 kg in the third group. At 30 days of age, the body weight of the lambs was 10.19 kg in the first group, 11.39 kg in the second and 12.49 kg in the third group. All these differences in body weight of lambs at birth were statistically highly significant (P_ 0.01). With 60 days of age, average body weight was 16.48 kg in the first group, 19.01 kg in the second and 20.49 kg in the third group. Differences between groups of lambs at this age were statistically very significant (P_0.01).On the end of experiment at 90 days of lambs age, we have found the following v...
Journal of Animal and Poultry Production, 2008
Variance components of birth weight (BW), weaning weight (WW) and preweaning average daily gain (ADG) in Barki lambs were estimated by Multitrait derivative free restricted maximum likelihood (MTDFREML). Six different animal models were fitted by including or excluding genetic maternal effects, maternal permanent environmental effects and covariance between direct and genetic maternal effects in order to determine the most appropriate model. Genetic maternal effects appeared to be the most important effects under the conditions of this study. The most appropriate model was that allowing for the genetic direct effects, both the genetic and permanent environmental components of the dam effects and the covariance between direct and maternal genetic effects (Model 6). From this model estimates of the heritability for genetic direct effect (h 2) were 0.29, 0.23 and 0.22 for BW, WW and ADG, while for maternal effects (m 2) were 0.05, 0.39 and 0.08 for the same traits. The genetic correlations between direct and maternal effects (ram) were positive for BW and ADG (0.78 and 0.37, respectively) and negative for WW (-0.34). The genetic direct correlation between BW and WW and between BW and ADG were 0.44 and-0.40, respectively. The corresponding genetic maternal correlation estimates were 0.54 and-0.34. The genetic direct and genetic maternal correlations between WW and ADG were 0.35 and 0.05. The study concluded that maternal effects have to be accounted for when estimate genetic parameters for BW, WW and ADG. The ram value obtained suggested that ADG is a good selection criterion for carrying out a joint selection on lamb's growth capacity (direct effects) and ewe's suckling ability (maternal effects).
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2017
Changes in live weight or dimension for a period of time are explained by growth curves. The objective of this work was to evaluate the growth curves in lambs of 6 (1stexperimental group) and/or 5 genotypes (2ndgroup) created on the basis of Improved Valachian (IV) and Tsigai (T) breed. All lambs (n = 209 and 205) were kept from birth to 9 months of age in identical conditions. Lambs of both experimental groups were weighed at birth and then every week until weaning (8 weightings totally). After weaning only breeding ewe and ram lambs were weighed (6 times totally). The growth of lambs created on the basis of IV a T breeds showed linear course till weaning expressed in regression equation y = 0.2659x + 5.352 and y = 0.2404x + 4.7364 respectively (R2= 0.985 and/or 0.9954; x – day of raising). Weight differences between genotypes grew after weaning. The average weight of lambs at the age of 150 days was 40.15 kg in the 1stgroup and 38.31 kg in the 2ndgroup respectively. The lowest wei...
1,700 records on Djallonké lambs accumulated over a period of nine years at the Ejura Livestock Breeding Station were analyzed to determine the influence of non-genetic factors on lamb growth traits. Lambs weighed 2.07± 0.01 kg at birth, 8.23 ± 0.07kg at weaning, and gained, 70.45 ± 0.05g per day during the pre-weaning period. Lambs weighed 11.81 ± 0.22 kg, 13.34 ± 0.43 kg and 20.61 ± 0.03kg at six months, eight months and one year respectively with an overall post weaning gain of 36.49 ± 0.10 g per day. Male lambs mostly weighed significantly heavier (P<0.01) than ewe lambs. Single born lambs were heavier (P<0.01) than twin-born lambs at all ages except for yearling weight where the difference in weight was not significant. Parity of dam significantly (P<0.01) influenced weaning weight and pre-weaning growth rate while season of birth was mostly significant (P<0.01) for all traits except six months and eight-month body weights.Estimated heritability values by paternal h...
Study of the growth trait S relation Ship of lamb S in the po Stnatal development
2013
Data from the Pirot improved sheep were use to estimate postnatal development and growth traits relationship of lambs from birth to weaning. the experiment included 360 lambs, divided into three groups (i, ii, iii). lamb traits included BW at birth and approximately 30d, 60d and 90d (weaning). lambs managed under conditions typical of the area. Male lambs in-group i had a total gain of 22.97 kg (0.255 kg/d), in group ii 25.97 kg (0.286 kg/d) (P<0.01). lambs in-group iii the total gain was 24.64 kg (0.274 kg/d), which was lower than lambs of group ii (P>0.05). on the other side, iii group of lambs had a higher gain than the i group (P<0.01). Development of female lambs in the postnatal period was slightly weaker. lambs of i group, from birth to weaning had a total gain of 21.27 kg, (0.236 kg/d), ii group was 23.32 kg (0.259 kg/d). the difference was statistically very significant (P<0.01). lambs of group iii had a total gain of 23.54 kg (0.261kg/d) and higher growth rate then lambs of group II, but not significant (P>0.05). From the other side, the difference in comparison with the groups III and I was very significant (P<0.01). Correlations between BWB and BW30, 60, 90 are ranged from low to moderate among the respective traits and ranged between positive from 0.001 to 0.365 and negative from-0.005 to-0.279. Can conclude that the selection should direct towards producing lambs with intermediate birth weight.
Estimation of Body Weight from Different Morphometric Measurements in Kajli Lambs
Journal of Animal and Plant Sciences
Data were collected on 214 Kajli lambs (109 females and 105 males) of different age groups maintained at Livestock Experiment Station Khizrabad (Sargodha) Pakistan. The animals were divided into three age groups as 0-3, 4-6 and 7-9 months. Within each group, the data on male and female lambs were collected separately. To predict the weight of Kajli sheep three body measurements (wither height, body length and heart girth) were recorded on each animal. Body measurements varied with increasing age of animals. In male lambs, the highest correlation (r 2) was observed between body weight and heart girth at 0-3 (r 2 =0.86) and 4-6 (r 2 =0.91) months of age, while in females the highest relationships 0.79 and 0.80 were observed between body weight & heart girth at 0-3 months and body weight & body length at 4-6 months of age, respectively. These correlations between body weight and body measurements were positive and significant (P<0.05). The regression analysis indicated that live wei...