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Time of ovulation in ewes after treatment with a prostaglandin F-2 analogue

Summary. Treatment of 18 cyclic Clun Forest ewes with two i.m. injections of ICI 80,996, given 9 days apart and without reference to stage of the oestrous cycle, synchronized ovulation in all ewes at a mean time interval of 73·1 ±1·6 (s.e.m.) h from the second injection. The interval from the LH peak to ovulation was 22·6 ± 0·7 h and this is comparable to previously reported figures for a natural oestrus.