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.
- British Veterinary Association. All rights reserved.
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