Laboratory of biotechnologies related to animal reproduction, University Saad Dahlab Blida, Blida, Algeria.
Faculty of Biology, University of Science and Technology Houari Boumediene Bab Ezzouar, Algiers, Algeria.
Trop Anim Health Prod. 2024 Sep 6;56(7):256. doi: 10.1007/s11250-024-04100-0.
Growth and reproductive performance traits are important economic indicators for analyzing the overall performance of breeding systems. This study aims to evaluate the comparative performance of two Algerian sheep (Rumbi and Hamra) in terms of growth and reproductive performance, and the effect of factors such as breed, season of birth, mode of birth and age of the mother on this performance in a semi-intensive breeding system. The reproductive performance of 577 Rumbi ewes and 1328 Hamra ewes bred at the Tiaret and Saïda experimental stations respectively, was analyzed using performance monitoring data. Fertility rates for the Rumbi and Hamra breeds of 87.14% and 78.8% respectively were practically similar (p > 0,05). Litter size at birth and weaning was significantly higher in the Hamra breed than in the Rumbi breed (p < 0,05). Weaning mortality was significantly higher in the Hamra breed than in the Rumbi breed, with an average of 22.60% versus 14.94% (p < 0,05). The effect of factors showed that there was a highly significant effect of the mother's age and season of birth on the reproductive performance of the Hamra and Rumbi breeds with a p < 0.0001 on fertility, litter size at birth, litter size at weaning and fertility. There was a significant effect of the year factor on reproductive performance with p = 0,013 for the Hamra breed and p = 0,031 for the Rumbi breed. The results of this study showed that Rumbi lambs were heavier at birth than Hamra lambs. The values observed were 4,86 kg versus 3,10 kg for the Hamra breed, with a highly significant difference (p < 0,0001), so that the average daily pre-weaning weight gains of Rumbi lambs were higher than those of Hamra lambs, at 0,195 kg/day versus 0,113 kg/day for Hamra lambs, with a high significance (p < 0,0001). The effect of factors showed that there was a significant effect of the mother's age on the ADGs (0-30), (30-70) and (70-90) of the Hamra and Rumbi breeds with a p = 0,034 and p = 0,02 respectively. There was also a highly significant effect of the birth mode effect on ADGs (0-30), (30-70) and (70-90) only for the Hamra breed with a p = 0,004. The effect of the birth weight on ADGs was not significant for both Hamra and Rumbi breeds with a p > 0,05. According to the findings of this study, the Hamra breed had superior reproductive potential and the Rumbi breed had superior growth. The Hamra breed showed better maternal skills in terms of fertility and prolificacy, while the Rumbi breed showed better lamb growth performance. Consequently, these results could be used for selective sheep breeding, taking into account the random effects of the environment and the potential of each breed.
生长和繁殖性能是分析繁殖系统整体性能的重要经济指标。本研究旨在评估两种阿尔及利亚绵羊（Rumbi 和 Hamra）在生长和繁殖性能方面的比较表现，并评估品种、出生季节、出生方式和母羊年龄等因素对这种性能的影响，研究在半集约化繁殖系统中。分别在蒂亚雷特和赛伊达实验站饲养的 577 只 Rumbi 母羊和 1328 只 Hamra 母羊的繁殖性能，通过性能监测数据进行分析。Rumbi 和 Hamra 品种的受胎率分别为 87.14%和 78.8%，实际上相似（p>0.05）。Hamra 品种的产仔数和断奶时的产仔数明显高于 Rumbi 品种（p<0.05）。Hamra 品种的断奶死亡率明显高于 Rumbi 品种，平均为 22.60%对 14.94%（p<0.05）。因素的影响表明，母羊的年龄和出生季节对 Hamra 和 Rumbi 品种的繁殖性能有高度显著的影响，p<0.0001 对受胎率、产仔数、断奶时的产仔数和受胎率。繁殖性能有显著的年份因素影响，p=0.013 对 Hamra 品种和 p=0.031 对 Rumbi 品种。本研究结果表明，Rumbi 羔羊的初生重比 Hamra 羔羊重。观察到的数值分别为 4.86kg 对 3.10kg 对 Hamra 品种，差异非常显著（p<0.0001），因此 Rumbi 羔羊的平均日增重高于 Hamra 羔羊，分别为 0.195kg/天对 0.113kg/天对 Hamra 羔羊，差异非常显著（p<0.0001）。因素的影响表明，母羊的年龄对 Hamra 和 Rumbi 品种的 ADG（0-30）、（30-70）和（70-90）有显著影响，p=0.034 和 p=0.02。出生方式对 ADG（0-30）、（30-70）和（70-90）的影响也非常显著，仅对 Hamra 品种的影响为 p=0.004。出生体重对 Hamra 和 Rumbi 品种的 ADG 没有显著影响，p>0.05。根据本研究的结果，Hamra 品种具有较高的繁殖潜力，Rumbi 品种具有较高的生长性能。Hamra 品种在产仔数和产仔数方面表现出更好的母性技能，而 Rumbi 品种在羔羊生长性能方面表现更好。因此，这些结果可用于选择性绵羊育种，同时考虑到环境的随机效应和每个品种的潜力。
