Lees J L
Vet Rec. 1978 Mar 18;102(11):232-6. doi: 10.1136/vr.102.11.232.
Most studies on reproductive efficiency in sheep have concerned the prolificacy of the ewe and the lambing rate of the flock. Some work has been done on reproductive failure but this has seldom separated fertilisation rate from embryonic and fetal loss. Inadequate attention has been given to the level of barrenness in working flocks and to the effect of the ram on conception rate and litter size.
大多数关于绵羊繁殖效率的研究都关注母羊的多产性和羊群的产羔率。在繁殖失败方面已经开展了一些工作，但很少将受精率与胚胎和胎儿损失区分开来。对生产羊群中的空怀水平以及公羊对受孕率和产仔数的影响关注不足。
