Wilson R T
Trop Anim Health Prod. 1976 May;8(2):103-14.
The results of an intensive 15 months' study of 10 flocks of indigenous sheep are recorded. Lambing rates approach 1.5 lambs per ewe per year, but a death rate of 23 per cent and an offtake of 27 per cent, means that flock numbers are probably slightly declining. Twins account for 14 per cent of all births but the death rate of twin lambs is almost twice that of single lambs up to 6 months of age. Increased productivity is therefore more likely to be achieved by improving the survival and growth rates of single lambs than by selection for twinning. The weighted average rate of lightweight gain for all surviving lambs is 82 g per day up to 1 year of age, and is better than that recorded for any other indigenous African sheep. Meat production per kg of breeding female, at 0.253 kg up to 6 months of age of the young, is almost six times the production of cattle under the same management and environmental conditions, but is inferior to that of goats.
记录了对10群本地绵羊进行的为期15个月的深入研究结果。产羔率接近每年每只母羊产1.5只羔羊，但死亡率为23%，出栏率为27%，这意味着羊群数量可能略有下降。双胞胎占所有出生羔羊的14%，但在6个月龄前，双胞胎羔羊的死亡率几乎是单胎羔羊的两倍。因此，提高单胎羔羊的存活率和生长率比选择产双羔更有可能提高生产力。所有存活羔羊到1岁时的平均日增重加权率为每天82克，高于非洲其他任何本地绵羊的记录。在相同管理和环境条件下，每千克繁殖母羊到6个月龄时的肉产量为0.253千克，几乎是牛产量的六倍，但低于山羊。
