Abstract
A significant proportion of ewes mated in spring do not lamb because they return to anoestrus before conception. In a flock of 661 artificially inseminated Merino ewes, PMSG, the “ram effect” and progestagens were used to stimulate ovulation and oestrus in non-pregnant ewes. Injection of PMSG increased the proportion of non-pregnant ewes returning to oestrus from 56% to 82% ( P < 0.001). Progestagen priming increased the proportion of ewes in the flock that lambed from 34% to 45% ( P < 0.01). These two findings suggest ways by which the reproductive performance of ewes mated in spring could be improved.
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