Effect of Supplemental Human Chorionic Gonadotrophs on Ovulation in Hormone-Treated Gilts

摘要

Injection of 200 IU human chorionic gonadotrophs (hCG; Chorulon, Merck Animal Health, Summit, NJ) at 24 or 48 h after injection of 400 IU equine chorionic gonadotrophin combined with 200 IU hCG (PG6009, Merck Animal Health, Summit, NJ) increased earlyluteal blood progesterone concentrations in gilts (Manjarin et al. 2010a). Interestingly, injecting sows with PG600 at weaning followed by a supplemental 200 IU hCG at 24 hours reduced the farrowing rate (Manjarin et al. 2010b) but, in contrast, we haveshown improved reproductive performance of anoestrus sows treated at seven days after weaning. The objective of this experiment was to test the hypothesis that an additional injection of the LH analogue hCG will improve the ovarian responses of gonadotrophin-stimulated prepubertal gilts resulting in an increased ovulation rate.