Ovarian follicular development, estrus, and ovulation in seasonally anestrous sows treated seven days post weaning with equine and human chorionic gonadotropins

Abstract

Seasonally anestrous sows were identified on day 7 after weaning and treated either with equine and human chorionic gonadotropins or saline (control). Gonadotropin treatment stimulated ovarian follicular development, and more treated sows than controls expressed estrus, were inseminated, ovulated, and became pregnant within 1 week after treatment.