This study retrospectively investigated the effect of breed and season on the lambing/kidding dynamics, growth performance, neonatal viability, and weaning dynamics of sheep (Damara, Dorper, and Swakara) and goats (Boer goat and Kalahari Red) at a farm in the Khomas Region of Namibia between 2004 and 2015. Litter size was dependent on breed (X²(12, N = 3388) = 796, p < 0.001), with twinning more frequent in Dorper sheep and Kalahari Red and Boer goats than in the Damara and Swakara sheep (p < 0.05), while triplets were more prevalent in the Dorper sheep and Kalahari Red goats (2.8% and 1.0%, respectively; p < 0.05). Distribution of birth weight categories was dependent on breed. There was a significant difference in the proportions of birth weight categories between breeds (X²(12, N = 3388) = 467, p < 0.001) whereby Dorper lambs were mostly born weighing below 3 kg (2.6%, p < 0.05); Boer goat kids, Kalahari Red kids, and Damara lambs were mostly born weighing 3 to < 4 kg (4.3%, 6.3% and 19.9%, respectively; p < 0.05); Swakara lambs were mostly born weighing 4 to < 5 kg (12.2%, p < 0.05), and Swakara lambs were mostly born weighing ≥ 5 kg (3.3% and 2.3%, respectively, p < 0.05). Weaning age categories were dependent on breed (X²(12, N = 3388) = 241, p < 0.001) whereby Dorper lambs were mostly weaned at below 3 months of age (2.8%, p < 0.05); Damara lambs were mostly weaned at 3 to < 5 months of age (12%, p < 0.05), and Boer goat kids were mostly weaned at ≥ 5 months of age (0.9%, p < 0.05). Neonatal viability was dependent on breed (X²(8, N = 3388) = 49.2, p < 0.001) whereby Dorper lambs were more susceptible to abortions and neonatal deaths (0.6% and 1.5%, respectively; p < 0.05) than the rest of the breeds. Breed and lambing season interacted to produce effects on the birth weight of offspring although lambing season alone did not have a significant effect on Boer goat and Kalahari Red kids’ birth weights.

这项研究回顾性研究了品种和季节对绵羊（Damara，Dorper和Swakara）和山羊（Boer山羊和Kalahari Red）的产羔/结节动力学，生长性能，新生儿生存力和断奶动力学的影响。 2004年至2015年间，纳米比亚的霍马斯地区。产仔量取决于品种（X ²（12，N  = 3388）= 796，p  <0.001），双胞胎在多珀山羊，卡拉哈里红山羊和波尔山羊中比在达马拉中更频繁和Swakara绵羊（p  <0.05），而三胞胎在Dorper绵羊和Kalahari Red山羊中更为普遍（分别为2.8％和1.0％；p <0.05）。出生体重类别的分布取决于品种。不同品种之间的出生体重类别比例存在显着差异（X ²（12，N  = 3388）= 467，p  <0.001），其中杜泊羔羊的出生体重大多低于3 kg（2.6％，p  <0.05）；布尔山羊，卡拉哈里（Kalahari Red）和达马拉（Damara）羔羊的体重大多在3至4公斤之间（分别为4.3％，6.3％和19.9％；p  <0.05）；Swakara羔羊出生时体重在4到<5 kg（12.2％，p  <0.05），而Swakara羔羊出生时体重在≥5 kg（分别为3.3％和2.3％，p  <0.05）。断奶年龄类别取决于品种（X²（12，N  = 3388）= 241，p  <0.001），其中杜泊羔羊大部分在3个月以下的年龄断奶（2.8％，p  <0.05）；达玛拉羔羊大部分在3到<5个月大时断奶（12％，p  <0.05），布尔山羊羔羊大多数在≥5个月大时断奶（0.9％，p  <0.05）。新生儿生存能力取决于品种（X ²（8，N  = 3388）= 49.2，p  <0.001），因此杜泊羔羊更容易流产和新生儿死亡（分别为0.6％和1.5％；p <0.05）。繁殖和羔羊季节相互作用对后代的出生体重产生影响，尽管单独的羔羊季节对波尔山羊和卡拉哈里红孩子的体重没有显着影响。