Therapeutic effect of GnRH-A (Buserelin 10 μg) treatment at weaning on follicular growth was monitored by transrectal ultrasonography in sows. After GnRH-A treatment, plasma concentrations of estradiol-17β and IGF-1 have increased, and the diameter of ovulatory follicles has enlarged compared to those in the controls. There was neither difference in the interval to the estrus after weaning nor litter size between GnRH-A treatment and controls. GnRH-A treatment stimulates the ovarian function after weaning and enhances conception rates in sows.
離乳後の種雌豚の卵巣所見を経直腸超音波検査法により観察するとともに, 離乳時に酢酸プセレリン10μg (GnRH-A) を投与し, その後の卵胞発育に対する影響を検討した. その結果, GnRH-Aの投与群では, 発情時の血中E2濃度や投与後のIGF-1濃度が無処置群に比べ増加し, 排卵卵胞の直径が増加した. 一方, 離乳後発情回帰までの間隔や産子数には無処置群との問に違いはみられなかった. 今回, GnRH-Aの授与で離乳後の種雌豚の卵巣機能が賦活され, 高い受胎率が得られた.