Fertility in Merino Ewes in Artificial Insemination Programmes following Synchronization of Ovulation Using Cloprostenol, a Prostaglandin Analogue

Ten field and laboratory experiments were conducted in which Merino ewes were treated with one or two 125pg injections of Cloprostenol, an analogue of prostaglandin F2a (PG). All treatments commenced in the luteal phase of the oestrous cycle. Sixty-six percent of ewes were detected in behavioural oestrus within 64 hr of completion of treatments although 95% of all treated ewes ovulated in apparent synchrony.