Bogdan Cekic - Academia.edu (original) (raw)
Papers by Bogdan Cekic
Animals, Jun 10, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
The aim of the study was to evaluate how the process of cryopreservation influenced the morpholog... more The aim of the study was to evaluate how the process of cryopreservation influenced the morphological status of ram sperm. The experiment was carried out with 26 sexually matured, pure bred rams during their breeding campaign. The animals were divided in two groups according to the breed – 15 rams from Synthetic Population of Bulgarian Milk (SPBM) and 11 rams from Sofia breed (SB). The sperm morphology was evaluated under microscope (Nikon Eclipse E200, Japan) by staining with SpermBlue (Microptic, Spain), performed according to the manufacturer's protocol, and observed under bright field with magnification of ×40. Cryopreservation of semen straws was done by the method of Cassou (1964). After cryopreservation, the percentage of spermatozoa with normal morphology decreased and those with abnormal morphology increased. This difference was more pronounced at rams from SPBM compared to SB rams. After freezing, the percentage of spermatozoa with damage to the head at rams from both ...
1st INTERNATIONAL SYMPOSIUM ON BIOTECHNOLOGY : proceedings
Meat colour was evaluated in 36 goat kids of both genders equally from three breeds: Alpine, Balk... more Meat colour was evaluated in 36 goat kids of both genders equally from three breeds: Alpine, Balkan and Serbian white breed. Animals were slaughtered at 18 kg of body weight and three muscles were analysed for colour characteristics and pH value: m. longissimus lumborum, m. psoas major (tenderloin) and m. semimembranosus. pH values differ significantly only for m. longissimus lumborum muscle, whereas Balkan kids had a significantly higher pH value than Alpine and Serbian white (p<0.001). The goat breed significantly affected meat CIEL*a*b* values for all muscles analysed. Lightness (L*) was generally the highest for Balkan and lowest for the Alpine breed. The differences in redness (a*) and Chroma values (C*) were not significant, while the yellowness only differed for m. longissimus lumborum muscle, whereas Serbian white kids had higher b* values compared to Alpine kids. As a colour saturation characteristic, the hue angle was higher in meat from indigenous breeds (Balkan and Se...
Biotehnologija u stocarstvu
The research included a total of 921 lambs, 474 ewes and 8 sjenicke sheep rams from 4 different f... more The research included a total of 921 lambs, 474 ewes and 8 sjenicke sheep rams from 4 different farms. The aim of the research was to examine the influence of the farm, cultivation technology and the influence of rams within the farm on production indicators. Statistical analysis showed that the body weight of lambs at birth ranged from 3.37 to 4.03 kg (average 3.68 kg), at 30 days from 11.51 to 12.41 kg (average 12.07 kg) and from 90 days from 27.82 to 29 kg (average 28.65 kg). A statistically highly significant influence of the farm was determined (P<0.01) on the body weight of lambs in all three control periods, as well as on the body weight of sheep and on the fertility of sheep. The influence of the ram on the body weight of the lambs at birth was statistically very significant within the farm (P<0.01). When it comes to the percentage share of birth type by farm, farm 1 had the most singletons (59.13%) both within the farm and in comparison between other farms, while ther...
Biotehnologija u stocarstvu
Lipska sheep is an autochthonous Serbian population from the group of Pramenka (Zapfel) sheep, br... more Lipska sheep is an autochthonous Serbian population from the group of Pramenka (Zapfel) sheep, bred in the area around Smederevo, Pozarevac and Mladenovac. The average weight of male animals (BW) is 95 kg and 62 kg of female animals. Other measurements of female animals are: wither height (WH) 74 cm, body length (BL) 78 cm, chest width (CW) 23 cm, chest depth (CD) 40 cm and hearth girth (HG) 91 cm. In the last sixty years, adult female animals gained in average ten kilograms of weight. Other linear measures also increased. The increase is a consequence of better animal management, especially improved diet. Since the reduction of the size of the population, larger animals have dominated, which probably caused the change in the genetic constitution of the breed. Female animals of Lipska sheep are higher compared to the animals of other fifteen Pramenka breeds with the exception of Istrian sheep. The area from which Lipska sheep originates has better soil and richer vegetation compared...
Biotehnologija u stocarstvu
In order to evaluate the effect of raw meat's freezing/thawing process on meat products produ... more In order to evaluate the effect of raw meat's freezing/thawing process on meat products produced from them, frankfurter's quality was monitored. Fresh beef meat was grounded and separated into two lots - the first lot was immediately used in the preparation of frankfurters (G1F), and the other lot was frozen and stored at -18?C for 4 weeks, when it was used in the preparation of the second group of frankfurters (G2F). Physicochemical and technological properties were investigated on fresh (CG-FM) and thawed meat (G-F/TM) samples and the frankfurters made from these samples. Frozen storage significantly affected (p<0.05) moisture, TBA value, instrumental color parameters (L*a*b*), WHC, total pigment, and total heme pigment in the raw meat samples; some frankfurters characteristics, such as moisture, L*(lightness), a* (redness) and b* (yellowness) were affected (p<0.05). However, the differences in the final products' process loss/cooking loss/frying loss and FRP wer...
Biotehnologija u stocarstvu
The current study aimed to examine the percentage changes of viability sperm and the activity of ... more The current study aimed to examine the percentage changes of viability sperm and the activity of the enzymes LDH, ALP, GOT / AST, GPT / ALT in the sperm plasma of Lacaune rams, before and after cryopreservation. For this purpose, five rams were examined, and two ejaculates were obtained from each ram. Ejaculates are collected by the method of artificial vagina, during the insemination campaign. All ejaculates were diluted with a 6AG extender and frozen by the Cassou?s sequin method. Sperm viability was determined by eosin and nigrosine smears, and enzyme activity was examined spectrophotometrically. As a result, the percentage of vital sperm after cryopreservation decreased by 15% (P ? 0.001). The freezing and thawing process also reduced the activity of the enzymes LDH, ALP, GOT / AST and GPT / ALP. In conclusion, the observed enzymes, in relation to sperm vitality, could be used as indicators to optimize the protocols for cryopreservation of ram?s sperm.
Proceedings of the 13th International Symposium “Modern Trends in Livestock Production”, 6 – 8 October 2021, Belgrade, Serbia, Oct 1, 2021
Pirot breed is a highly endangered autochthonous population of sheep in Serbia, from which severa... more Pirot breed is a highly endangered autochthonous population of sheep in Serbia, from which several important national brands originate: Pirot lamb, Pirot carpet and Pirot hard cheese. In the available literature, there are no data on hematological and biochemical parameters of the blood of this population. The aim of this paper, which represents the beginning of the research, is to determine the above indicators in the blood of Pirot Pramenka, which will contribute to the preservation of this population. Since the breed affects the value of blood parameters, the obtained results will be used to define reference intervals for this population and compare with others. The study included 30 clinically healthy sheep, 2-3 years old, from the area of Stara Planina. Blood samples were taken by puncture to c. jugularis from which, after coagulation and centrifugation, blood serum was extracted. Haematological analyzes were performed in the next 24 hours on a Siemens Advia 120 analyzer. The following parameters were determined: total number of leukocytes, erythrocytes, platelets, hemoglobin content, hematocrit value, MCV, MCH, PLT and MPV. Biochemical blood tests were performed using Olympus AU 400 analyzers.The following parameters were determined: total protein, albumin, globulin, urea, creatinine, glucose, total bilirubin, cholesterol. Also, the following minerals were determined-calcium, phosphate and magnesium, and following enzymes: AST, GGT and CK. Descriptive statistical analysis was performed using the statistical package STATISTICA (Version 8). Hematological indicators of Pirot pramenka are in reference intervals for sheep, which indicates good animal health status. Biochemical parameters of Pirot pramenka blood were within defined physiological limits, except for creatinine and phosphorus levels, which were below the lower limit, which is a consequence of dehydration and reduced alimentary intake. In accordance with the obtained results, it is necessary to correct the diet.
The paper presents the effects of replacing fish meal with vegetable protein on the intensity of ... more The paper presents the effects of replacing fish meal with vegetable protein on the intensity of the growth and feed utilization of lambs of the MIS population, in intensive fattening. The trial was carried out on 40 lambs, age of 30 days, divided into 2 groups. Animals were fed a concentrated mixture and lucerne hay at will, in addition to mothers' milk. The effect of using isoprotein feed mixtures, which differed in terms of the protein component, on the production parameters of the lambs in fattening, was examined. The lambs on the treatment I received fish meal as a source of protein, while the animals on treatment II consumed Eko fish meal-herbal substitute for fish meal, consisting of domestic feeds of known origin such as genetically unmodified and thermally processed meal of peeled soybean grains, isolate of soy protein, gluten, livestock yeast with the addition of minerals, amino acids, vitamins, enzymes and other additives. Statistical processing of the obtained data was carried out using the SPSS Statistica program, Version 20. The average daily gain of lambs on treatments I and II was 0.320 and 0.283 kg, respectively. Consumption of dry matter, protein and energy in analogue treatments was 0.819: 0.823 kg; 152.62: 157.04 g and 5.65: 5.73 MJ, respectively. The conversion of dry matter (kg/kg of gain) was 2.56: 2.91; of total proteins 476.9: 554.9g and energy (MJ NEM/kg) 17.65: 20.25, respectively. The efficiency of protein utilization-PER (g of gain/g of consumed protein) in the above treatments was: 2.09 and 1.80, respectively. There were no statistically significant differences between the examined treatments (P>0.05). Since the source of protein did not significantly affect the intensity of growth and the food utilization in lambs of Mis population in intensive fattening (P>0.05), fish meal can be replaced by Eko fish meal-plant protein, since according to Commission Decision 9/2001 on protection BCE (OJEC, 2001), there is a distance to the use of fish meal, as a source of protein.
Due to the political, demographic and economic situation, agriculture in Serbia changed, includin... more Due to the political, demographic and economic situation, agriculture in Serbia changed, including also the structure in sheep breeds. Traditional sheep breeding centers with large pasture areas and large number of local breeds and strains are deserted, and, consequently, sheep production focused on meat production, in intensive systems, but in expensive and inadequate ways. This led to decreasing number in local breeds (pramenka) with its strains. In this research, two most numerous pramenka strains were observed, Sjenica and Svrljig strains, concerning their number, productive and reproductive parameters. Population of registered and active heads in 2020. was 139,319 for Sjenica and 19585 for Svrljig strain. Weight on birth for Sjenica and Svrljig lambs were 3.20 and 3.15, while weight after 30 days and on weaning was 11.06, 11.42 and 27.02 and 24.97, respectively. Lambing index was 1.27 for Sjenica and 1.29 for Svrljig strain. Svrljig strain had longer lactation (104 vs. 88 days)...
Large Animal Review, Mar 10, 2021
Biotehnologija u stocarstvu
Considering the fact that sheep production has an important role in agriculture of Serbia, lamb p... more Considering the fact that sheep production has an important role in agriculture of Serbia, lamb performance is essential. Objective of the study was to investigate effect of year, lambing season, sex and birth type on growth performances in lambs of MIS breed. Animal data (birth date, birth type, sex, birth weight -BW0, body weight after 30 days - BW30 and body weight after 90 days - BW90) are gained from control of productive parameters maintained from 2011 to 2020. Research was conducted on the sample of 1592 lambs. Average daily gain from birth to 30 days (ADG1), from 30 to 90 days (ADG2), and from birth until 90 days (ADG3), were calculated and included in analysis. Calendar year was divided in four seasons, each season consists from 3 months: winter, spring, summer and autumn. Average body weights (? standard deviation) at birth, after 30 and 90 days were 4.41 kg (? 0.99), 14.11 kg (? 2.80), 24.05 kg (? 3.86), respectively. Average daily gains were 319.87 g (? 74.97), 164.98 g ...
Quantitative genetic analysis of variability and relationship of lambs body weight traits in indi... more Quantitative genetic analysis of variability and relationship of lambs body weight traits in indigenous pirot sheep population are done. The the examined lambs had high variability which very suitable for selection on a larger weight. There is a high and very significant correlation between the body weight of lambs with 30 and 60 days (.969 **) and the weight with 30 and 90 days ( .914 **). There is also a highly significant correlation between the weights of lambs with 60 and 90 days of age (.904 **). From our research, we can see that the first month of the lamb's life is very important for the further development of the body. There is different level of correlation between weight of lambs. This gives us an idea to say that many paragenetic factors are crucial for the growth of lambs from birth to weaning. The coefficient of multiple determination (R2) is 0.845 which means that 8.45% of the lamb's body weight variance at 90 days is determined by the variance of the set of ...
Biotehnologija u stocarstvu
The strategy of conservation of endangered sheep populations implies morphological and genetic ch... more The strategy of conservation of endangered sheep populations implies morphological and genetic characterization, as basic preconditions for their conservation. The aim of this study was to determine the morphometric characteristics, their correlations and the index of physical development of Pirot pramenka, which has the status of the most endangered population in Serbia. The measuring was performed on 30 sheep, aged 3 years, reared in the area of Stara Planina. The descriptive statistical procedure was performed using the statistical package Statistica (version 8). The average height at the withers was 56.31 cm, body length 62.93 cm, chest width 18.37 cm, chest depth 25.96 cm, chest circumference 77.59 cm, shin circumference 6.70 cm. The strongest and significantly positive correlation (P <0.05) was found between chest depth and height at withers (0.65), body length (0.58) and body weight (0.56). Pirotska pramenka has slightly higher indices of format, chest and massiveness, in ...
The investigation was conducted in population of Mis breed of sheep, divided into three groups. F... more The investigation was conducted in population of Mis breed of sheep, divided into three groups. For reproduction had use rams of Ile de France breed. Induction and synchronization of oestrus was done off-season in October. The percentage of lambing sheep, sheep fertility, and number of lambs acquired per father, sex and birth type of lambs were observed. Ram 1 had a highest number of ewes lambed with an excellent percentage of mating success and highest fertility rate of ewes with differences on fertility rate of 17% (between group of ewes in ram 1 and ram 2), 36% (group of ewes in ram 1 and ram 3) and 19% (group of ewes in ram 2 and ram 3).The highest birth weight were on lambs born single from ram 3, born twins from ram1, triplets of ram 3. For the lambs born quadruplets (unfortunately only in rams 1 and 2 with one lamb of each was alive) the lamb of ram 2 was higher in birth weight. The male and female lambs of ram 3 got the highest birth weight while the female lambs of ram 1 ac...
Animals, Jun 10, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
The aim of the study was to evaluate how the process of cryopreservation influenced the morpholog... more The aim of the study was to evaluate how the process of cryopreservation influenced the morphological status of ram sperm. The experiment was carried out with 26 sexually matured, pure bred rams during their breeding campaign. The animals were divided in two groups according to the breed – 15 rams from Synthetic Population of Bulgarian Milk (SPBM) and 11 rams from Sofia breed (SB). The sperm morphology was evaluated under microscope (Nikon Eclipse E200, Japan) by staining with SpermBlue (Microptic, Spain), performed according to the manufacturer's protocol, and observed under bright field with magnification of ×40. Cryopreservation of semen straws was done by the method of Cassou (1964). After cryopreservation, the percentage of spermatozoa with normal morphology decreased and those with abnormal morphology increased. This difference was more pronounced at rams from SPBM compared to SB rams. After freezing, the percentage of spermatozoa with damage to the head at rams from both ...
1st INTERNATIONAL SYMPOSIUM ON BIOTECHNOLOGY : proceedings
Meat colour was evaluated in 36 goat kids of both genders equally from three breeds: Alpine, Balk... more Meat colour was evaluated in 36 goat kids of both genders equally from three breeds: Alpine, Balkan and Serbian white breed. Animals were slaughtered at 18 kg of body weight and three muscles were analysed for colour characteristics and pH value: m. longissimus lumborum, m. psoas major (tenderloin) and m. semimembranosus. pH values differ significantly only for m. longissimus lumborum muscle, whereas Balkan kids had a significantly higher pH value than Alpine and Serbian white (p<0.001). The goat breed significantly affected meat CIEL*a*b* values for all muscles analysed. Lightness (L*) was generally the highest for Balkan and lowest for the Alpine breed. The differences in redness (a*) and Chroma values (C*) were not significant, while the yellowness only differed for m. longissimus lumborum muscle, whereas Serbian white kids had higher b* values compared to Alpine kids. As a colour saturation characteristic, the hue angle was higher in meat from indigenous breeds (Balkan and Se...
Biotehnologija u stocarstvu
The research included a total of 921 lambs, 474 ewes and 8 sjenicke sheep rams from 4 different f... more The research included a total of 921 lambs, 474 ewes and 8 sjenicke sheep rams from 4 different farms. The aim of the research was to examine the influence of the farm, cultivation technology and the influence of rams within the farm on production indicators. Statistical analysis showed that the body weight of lambs at birth ranged from 3.37 to 4.03 kg (average 3.68 kg), at 30 days from 11.51 to 12.41 kg (average 12.07 kg) and from 90 days from 27.82 to 29 kg (average 28.65 kg). A statistically highly significant influence of the farm was determined (P<0.01) on the body weight of lambs in all three control periods, as well as on the body weight of sheep and on the fertility of sheep. The influence of the ram on the body weight of the lambs at birth was statistically very significant within the farm (P<0.01). When it comes to the percentage share of birth type by farm, farm 1 had the most singletons (59.13%) both within the farm and in comparison between other farms, while ther...
Biotehnologija u stocarstvu
Lipska sheep is an autochthonous Serbian population from the group of Pramenka (Zapfel) sheep, br... more Lipska sheep is an autochthonous Serbian population from the group of Pramenka (Zapfel) sheep, bred in the area around Smederevo, Pozarevac and Mladenovac. The average weight of male animals (BW) is 95 kg and 62 kg of female animals. Other measurements of female animals are: wither height (WH) 74 cm, body length (BL) 78 cm, chest width (CW) 23 cm, chest depth (CD) 40 cm and hearth girth (HG) 91 cm. In the last sixty years, adult female animals gained in average ten kilograms of weight. Other linear measures also increased. The increase is a consequence of better animal management, especially improved diet. Since the reduction of the size of the population, larger animals have dominated, which probably caused the change in the genetic constitution of the breed. Female animals of Lipska sheep are higher compared to the animals of other fifteen Pramenka breeds with the exception of Istrian sheep. The area from which Lipska sheep originates has better soil and richer vegetation compared...
Biotehnologija u stocarstvu
In order to evaluate the effect of raw meat's freezing/thawing process on meat products produ... more In order to evaluate the effect of raw meat's freezing/thawing process on meat products produced from them, frankfurter's quality was monitored. Fresh beef meat was grounded and separated into two lots - the first lot was immediately used in the preparation of frankfurters (G1F), and the other lot was frozen and stored at -18?C for 4 weeks, when it was used in the preparation of the second group of frankfurters (G2F). Physicochemical and technological properties were investigated on fresh (CG-FM) and thawed meat (G-F/TM) samples and the frankfurters made from these samples. Frozen storage significantly affected (p<0.05) moisture, TBA value, instrumental color parameters (L*a*b*), WHC, total pigment, and total heme pigment in the raw meat samples; some frankfurters characteristics, such as moisture, L*(lightness), a* (redness) and b* (yellowness) were affected (p<0.05). However, the differences in the final products' process loss/cooking loss/frying loss and FRP wer...
Biotehnologija u stocarstvu
The current study aimed to examine the percentage changes of viability sperm and the activity of ... more The current study aimed to examine the percentage changes of viability sperm and the activity of the enzymes LDH, ALP, GOT / AST, GPT / ALT in the sperm plasma of Lacaune rams, before and after cryopreservation. For this purpose, five rams were examined, and two ejaculates were obtained from each ram. Ejaculates are collected by the method of artificial vagina, during the insemination campaign. All ejaculates were diluted with a 6AG extender and frozen by the Cassou?s sequin method. Sperm viability was determined by eosin and nigrosine smears, and enzyme activity was examined spectrophotometrically. As a result, the percentage of vital sperm after cryopreservation decreased by 15% (P ? 0.001). The freezing and thawing process also reduced the activity of the enzymes LDH, ALP, GOT / AST and GPT / ALP. In conclusion, the observed enzymes, in relation to sperm vitality, could be used as indicators to optimize the protocols for cryopreservation of ram?s sperm.
Proceedings of the 13th International Symposium “Modern Trends in Livestock Production”, 6 – 8 October 2021, Belgrade, Serbia, Oct 1, 2021
Pirot breed is a highly endangered autochthonous population of sheep in Serbia, from which severa... more Pirot breed is a highly endangered autochthonous population of sheep in Serbia, from which several important national brands originate: Pirot lamb, Pirot carpet and Pirot hard cheese. In the available literature, there are no data on hematological and biochemical parameters of the blood of this population. The aim of this paper, which represents the beginning of the research, is to determine the above indicators in the blood of Pirot Pramenka, which will contribute to the preservation of this population. Since the breed affects the value of blood parameters, the obtained results will be used to define reference intervals for this population and compare with others. The study included 30 clinically healthy sheep, 2-3 years old, from the area of Stara Planina. Blood samples were taken by puncture to c. jugularis from which, after coagulation and centrifugation, blood serum was extracted. Haematological analyzes were performed in the next 24 hours on a Siemens Advia 120 analyzer. The following parameters were determined: total number of leukocytes, erythrocytes, platelets, hemoglobin content, hematocrit value, MCV, MCH, PLT and MPV. Biochemical blood tests were performed using Olympus AU 400 analyzers.The following parameters were determined: total protein, albumin, globulin, urea, creatinine, glucose, total bilirubin, cholesterol. Also, the following minerals were determined-calcium, phosphate and magnesium, and following enzymes: AST, GGT and CK. Descriptive statistical analysis was performed using the statistical package STATISTICA (Version 8). Hematological indicators of Pirot pramenka are in reference intervals for sheep, which indicates good animal health status. Biochemical parameters of Pirot pramenka blood were within defined physiological limits, except for creatinine and phosphorus levels, which were below the lower limit, which is a consequence of dehydration and reduced alimentary intake. In accordance with the obtained results, it is necessary to correct the diet.
The paper presents the effects of replacing fish meal with vegetable protein on the intensity of ... more The paper presents the effects of replacing fish meal with vegetable protein on the intensity of the growth and feed utilization of lambs of the MIS population, in intensive fattening. The trial was carried out on 40 lambs, age of 30 days, divided into 2 groups. Animals were fed a concentrated mixture and lucerne hay at will, in addition to mothers' milk. The effect of using isoprotein feed mixtures, which differed in terms of the protein component, on the production parameters of the lambs in fattening, was examined. The lambs on the treatment I received fish meal as a source of protein, while the animals on treatment II consumed Eko fish meal-herbal substitute for fish meal, consisting of domestic feeds of known origin such as genetically unmodified and thermally processed meal of peeled soybean grains, isolate of soy protein, gluten, livestock yeast with the addition of minerals, amino acids, vitamins, enzymes and other additives. Statistical processing of the obtained data was carried out using the SPSS Statistica program, Version 20. The average daily gain of lambs on treatments I and II was 0.320 and 0.283 kg, respectively. Consumption of dry matter, protein and energy in analogue treatments was 0.819: 0.823 kg; 152.62: 157.04 g and 5.65: 5.73 MJ, respectively. The conversion of dry matter (kg/kg of gain) was 2.56: 2.91; of total proteins 476.9: 554.9g and energy (MJ NEM/kg) 17.65: 20.25, respectively. The efficiency of protein utilization-PER (g of gain/g of consumed protein) in the above treatments was: 2.09 and 1.80, respectively. There were no statistically significant differences between the examined treatments (P>0.05). Since the source of protein did not significantly affect the intensity of growth and the food utilization in lambs of Mis population in intensive fattening (P>0.05), fish meal can be replaced by Eko fish meal-plant protein, since according to Commission Decision 9/2001 on protection BCE (OJEC, 2001), there is a distance to the use of fish meal, as a source of protein.
Due to the political, demographic and economic situation, agriculture in Serbia changed, includin... more Due to the political, demographic and economic situation, agriculture in Serbia changed, including also the structure in sheep breeds. Traditional sheep breeding centers with large pasture areas and large number of local breeds and strains are deserted, and, consequently, sheep production focused on meat production, in intensive systems, but in expensive and inadequate ways. This led to decreasing number in local breeds (pramenka) with its strains. In this research, two most numerous pramenka strains were observed, Sjenica and Svrljig strains, concerning their number, productive and reproductive parameters. Population of registered and active heads in 2020. was 139,319 for Sjenica and 19585 for Svrljig strain. Weight on birth for Sjenica and Svrljig lambs were 3.20 and 3.15, while weight after 30 days and on weaning was 11.06, 11.42 and 27.02 and 24.97, respectively. Lambing index was 1.27 for Sjenica and 1.29 for Svrljig strain. Svrljig strain had longer lactation (104 vs. 88 days)...
Large Animal Review, Mar 10, 2021
Biotehnologija u stocarstvu
Considering the fact that sheep production has an important role in agriculture of Serbia, lamb p... more Considering the fact that sheep production has an important role in agriculture of Serbia, lamb performance is essential. Objective of the study was to investigate effect of year, lambing season, sex and birth type on growth performances in lambs of MIS breed. Animal data (birth date, birth type, sex, birth weight -BW0, body weight after 30 days - BW30 and body weight after 90 days - BW90) are gained from control of productive parameters maintained from 2011 to 2020. Research was conducted on the sample of 1592 lambs. Average daily gain from birth to 30 days (ADG1), from 30 to 90 days (ADG2), and from birth until 90 days (ADG3), were calculated and included in analysis. Calendar year was divided in four seasons, each season consists from 3 months: winter, spring, summer and autumn. Average body weights (? standard deviation) at birth, after 30 and 90 days were 4.41 kg (? 0.99), 14.11 kg (? 2.80), 24.05 kg (? 3.86), respectively. Average daily gains were 319.87 g (? 74.97), 164.98 g ...
Quantitative genetic analysis of variability and relationship of lambs body weight traits in indi... more Quantitative genetic analysis of variability and relationship of lambs body weight traits in indigenous pirot sheep population are done. The the examined lambs had high variability which very suitable for selection on a larger weight. There is a high and very significant correlation between the body weight of lambs with 30 and 60 days (.969 **) and the weight with 30 and 90 days ( .914 **). There is also a highly significant correlation between the weights of lambs with 60 and 90 days of age (.904 **). From our research, we can see that the first month of the lamb's life is very important for the further development of the body. There is different level of correlation between weight of lambs. This gives us an idea to say that many paragenetic factors are crucial for the growth of lambs from birth to weaning. The coefficient of multiple determination (R2) is 0.845 which means that 8.45% of the lamb's body weight variance at 90 days is determined by the variance of the set of ...
Biotehnologija u stocarstvu
The strategy of conservation of endangered sheep populations implies morphological and genetic ch... more The strategy of conservation of endangered sheep populations implies morphological and genetic characterization, as basic preconditions for their conservation. The aim of this study was to determine the morphometric characteristics, their correlations and the index of physical development of Pirot pramenka, which has the status of the most endangered population in Serbia. The measuring was performed on 30 sheep, aged 3 years, reared in the area of Stara Planina. The descriptive statistical procedure was performed using the statistical package Statistica (version 8). The average height at the withers was 56.31 cm, body length 62.93 cm, chest width 18.37 cm, chest depth 25.96 cm, chest circumference 77.59 cm, shin circumference 6.70 cm. The strongest and significantly positive correlation (P <0.05) was found between chest depth and height at withers (0.65), body length (0.58) and body weight (0.56). Pirotska pramenka has slightly higher indices of format, chest and massiveness, in ...
The investigation was conducted in population of Mis breed of sheep, divided into three groups. F... more The investigation was conducted in population of Mis breed of sheep, divided into three groups. For reproduction had use rams of Ile de France breed. Induction and synchronization of oestrus was done off-season in October. The percentage of lambing sheep, sheep fertility, and number of lambs acquired per father, sex and birth type of lambs were observed. Ram 1 had a highest number of ewes lambed with an excellent percentage of mating success and highest fertility rate of ewes with differences on fertility rate of 17% (between group of ewes in ram 1 and ram 2), 36% (group of ewes in ram 1 and ram 3) and 19% (group of ewes in ram 2 and ram 3).The highest birth weight were on lambs born single from ram 3, born twins from ram1, triplets of ram 3. For the lambs born quadruplets (unfortunately only in rams 1 and 2 with one lamb of each was alive) the lamb of ram 2 was higher in birth weight. The male and female lambs of ram 3 got the highest birth weight while the female lambs of ram 1 ac...