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OVULATION RATE OF FINN-DORSET SHEEP FOLLOWING UNILATERAL OVARIECTOMY OR CHLORPROMAZINE TREATMENT AT DIFFERENT STAGES OF THE OESTROUS CYCLE

Summary.: Treatment with 10 mg chlorpromazine/kg twice daily for six different 3-day periods during the oestrous cycle (five ewes/group) indicated that the ovulation rate was not depressed by any of the treatments. Treatment during the luteal phase of the cycle, however, raised the subsequent mean ovulation rate slightly (2·70 versus 2·27 eggs).

Unilateral ovariectomy on Day 2, 8 or 14 (eleven or twelve ewes/group) did not affect the total number of eggs shed (measured as the number of CL) at the oestrus immediately following ovariectomy.

It was concluded that in the sheep, the number of eggs to be ovulated is finally determined within the 3 days immediately preceding the onset of oestrus.