Effects of different lambing season on some reproductive characteristics of ewes and growth performance of lambs in Awassi sheep (original) (raw)
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Journal of Livestock Science, 2021
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Revista Científica de la Facultad de Ciencias Veterinarias
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Effect of mating method, sex and birth type on growth of lambs
Biotechnology in Animal Husbandry, 2013
Estrus synchronization methods was use to control the reproductive traits of sheep, as well as bringing more females at the same stage of estrus and ovulation. According to the points mentioned above, the aim of the present study was to investigate and compare mating method and influence of fixed factors on birth and weaning weight of lambs. Statistical analysis showed that exist difference in the body weights between genotypes of lambs. In the first group, the difference in weight of lambs at birth, regardless of mating method was not significant (P> 0.05), while in the second group, the difference was slightly significant (P <0.05). As for the birth type,sex and within the same genotype, there was a statistical significance (P <0.05) between singles obtained naturally, between the triplets obtained naturally and between triplets received hormonal method. All the differences between body weight at 30 days (mating method, sex and birth type under the same genotype) were statistically significant (P <0.05).The determined differences in the body weights at 60 days (sex, mating method and type of birth under the same genotype) were statistically significant (P <0.05). The results showed that the differences (mating method, sex and type of birth under the same genotype) were statistically significant (P <0.05), except in between body weight at 90 days in twins among two genotypes obtained by natural method, which were not statistically significant (P> 0.05).
Effect of Feeding Season on Reproductive and Productive Traits of Ewes and Suckling Lambs
This paper aims to investigate feeding season effect (winter and summer) on reproductive and productive traits of the ewes and suckling lambs. Biological investigations were conducted on 60 Merinolandschaf breed ewes aged 4 years on the average and their lambs (123) in the suckling-ablactation period. In the winter feeding season ewes were fed grain mixture (300 g daily) containing 60% oats, 30% maize and 10% soybean meal as well as hay (ad libitum). The lambs were suckling and they received forage mixture, quality hay and fresh water ad libitum. During the summer feeding season ewes grazed on the pastures. The lambs were suckling and received forage mixture, quality hay ad libitum and pasture green mass in smaller portions. While comparing winter to summer feeding season the ewes had longer gravidity period (150.76 and 150.40 days), more lambs at parturition (1.21 and 1.11) and ablactation (1.10 and 1.07), more twins (12 and 8), higher body weight during gravidity (65.52 kg and 61.86 kg) and increased body weight losses after lambing (7.72 kg and 6.44 kg). As for the body weight losses after lactation (7.94 kg and 7.78 kg) no statistically significant differences were determined between the feeding seasons. Birth weight of lambs was higher by 26.91% (4.15 kg and 3.27 kg) and at 60 days of age it was higher by 11.40% in winter compared to summer feeding season. Faster daily gains of lambs (by 7.21%) was determined during the winter feeding season. However, it was noticed that lambs aged from 40 th to 60 th and 20 th to 60 th day obtained higher daily gains (by 6.25% and 1.74%) in summer feeding season.
Small Ruminant Research, 2002
Ewe reproduction and productivity were studied in the highlands of Ethiopia in Horro and Menz ewes mated to lamb in both the wet and dry seasons from June 1992 to May 1997. The data included a total of 4890 mating records of which 2516 were Menz ewes and 2374 Horro ewes, with 2360 matings in the wet season and 2530 in the dry season. Menz sheep had a significantly higher (P < 0.001) weaning rate (lambs weaned per ewe mated) than the Horro ewes (0.73 versus 0.57, respectively) and ewes which lambed in the wet season had a significantly higher (P < 0.001) weaning rate than those that lambed in the dry season (0.76 versus 0.53, respectively). Menz ewes showed their superiority in weaning rate over the Horro ewes more clearly when lambing in the wet season (0.85 versus 0.67, respectively) than when lambing in the dry season (0.59 versus 0.47, respectively). Overall flock productivity was expressed in terms of potential offtake of yearling sheep from flocks of Menz or Horro ewes lambing in either the wet or dry seasons. Both in terms of number of yearling sheep for sale and total live weight for sale, the offtake of a flock of Menz sheep in this environment was approximately three-fold greater than a flock of Horro sheep when they lambed in the wet season and approximately two-fold greater when they lambed in the dry season. Season had no effect on offtake in Horro ewes, but the Menz ewes lambing in the wet season had about a 1.5-fold greater offtake than Menz ewes lambing in the dry season.
Czech J. Anim. Sci, 2002
e objective of this study was to evaluate the effect of crossing on body weight and growth ability of lambs from birth to weaning, including the effect of litter size, sex, dam age, dam weight at mating, dam weight after lambing and year of rearing. e study was conducted on the Awassi sheep flock and their crossbreds with Charollais and Romanov breeds maintained at the Agriculture Centre for Research and Production at Jordan University of Science and Technology, Irbid. In 1999 and 2000 the live weight was determined in 192 lambs (70 Awassi, 63 Awassi × Charollais F 1 crossbred and 59 Awassi × Romanov F 1 crossbred) at birth and subsequently every fortnight until weaning by weighing on digital scales to the nearest 0.1 kg. Average live weight of lambs at birth was 4.20 ± 1.15 kg and at the age of 15, 30, 45 and 60 days 8.72 ± 2.12 kg, 12.12 ± 2.77 kg, 15.50 ± 3.70 kg and 19.27 ± 4.59 kg, respectively. ADG of lambs from birth until weaning was 248 ± 0.07 g. Genotype of lambs and litter size affected ADG, live weight of lambs at birth, 15, 30, 45 and 60 days significantly (P ≤ 0.05-0.001). Investigations of the effect of sex on live weight of lambs at birth and at 60 days showed that the differences between males and females were statistically significant (P ≤ 0.05-0.01). Differences in ADG and live weight at 15, 30 and 45 days according to dam age were significant (P ≤ 0.05-0.01). e effect of dam weight at mating on live weight of lambs at birth, ADG until weaning and live weight at weaning was not confirmed. e effect of dam weight at lambing on ADG, live weight of lambs at birth, at 45 days of age and until weaning was not confirmed. Regressions of BW, ADG and weight at 15, 30, 45 and 60 days age of lambs on dam weight after lambing were significant (P ≤ 0.001). Likewise, live weight of lambs at birth, ADG until weaning and live weight at 15, 30 a 45 days of age were affected by the seasons of lambing (P ≤ 0.01-0.001).
Relationship of Birth Weight of Lambs with Age of Ewes at Service in Rambouillet Sheep
Data on birth weight of lambs and age of the dam at service in Rambouilet sheep maintained at the Livestock Experimental Station, Jaba, District Mansehra (NWFP), Pakistan were analyzed. The average age of the dam at service was 1337.57 ± 10.55 days. The least-square means for birth weight were 3.63 ± 0.11 and 3.41 ± 0.07 kg for single male and female lambs and 3.45 ± 0.12 and 3.29 ± 0.12 kg for male and female lambs born as twins. Age of the dam at service had a significant relationship with the birth weight of lambs. The correlation and regression coefficients between the above mentioned two traits were 0.37 and 0.025 ± 0.0001, respectively. Analysis of variance of age of the dam at service and birth weight of lambs due to regression revealed that this regression was statistically significant (P<0.01).
Influence of some factors on fertility and weight if sheep and body weight development of lambs
Biotehnologija u stocarstvu
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...