Abstract
The effectiveness of pregnant mares' serum gonadotrophin (PMSG) to stimulate ovarian activity and to induce oestrus in anoestrous sows after weaning of their first litter was evaluated. Anoestrous sows were given an intramuscular injection of 1000 i.u. PMSG 14 days after weaning and a greater number of PMSG-treated sows exhibited oestrus by day 21 after weaning than control sows (16/22 vs 7/24, x 2 = 8.7, P < 0.01). There was no significant effect on farrowing rate, ovulation rate, subsequent litter size or embryo mortality. Thirty-six anoestrous sows were treated with 1000 i.u. PMSG on either day 14, 21, 28 or 35 post weaning and 78% exhibited oestrus within 5 days of treatment. A greater number of sows with quiescent ovaries on the day of treatment exhibited oestrus than sows whose ovaries were either cycling or had preovulatory follicles (25/29 vs 3/7, x 2 = 6.2, P < 0.05). These results indicated that treatment of anoestrous, first litter sows with 1000 i.u. PMSG at least 14 days after weaning effectively induced oestrus and ovulation in these sows within 5 days of treatment without reducing their subsequent reproductive performance.
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