title: Induction of ovulation in chronically hypophysectomized Booroola ewes.
abstract: Booroola Merino ewes, with (F+; N = 17) and without (++; N = 13) a copy of the fecundity gene were hypophysectomized and 6 weeks later were given an i.m. injection of PMSG (high, medium or low dose) followed by hCG. The induced ovulation rates were observed laparoscopically. Ovulation rates were significantly higher (P less than 0.01) in Booroola F+ ewes than in ++ ewes (8.00 +/- 1.66 s.e.m. vs 3.62 +/- 1.10 respectively). This suggests that the high fecundity of the Booroola ewe may be due primarily to ovarian rather than pituitary factors.
authors: Animal Research Institute, Werribee, Victoria, Australia.
authors: R C
authors: RC
authors: Fry
authors: I J
authors: IJ
authors: Clarke
authors: J T
authors: JT
authors: Cummins
authors: B M
authors: BM
authors: Bindon
authors: L R
authors: LR
authors: Piper
authors: L P
authors: LP
authors: Cahill
mesh_terms: D000818:Animals; D006063:Chorionic Gonadotropin / Q000494:pharmacology; D005260:Female; D005298:Fertility; D005796:Genes; D006064:Gonadotropins, Equine / Q000494:pharmacology; D007016:Hypophysectomy; D010062:Ovulation Induction / Q000662:veterinary*; D010902:Pituitary Gland / Q000502:physiology*; D012756:Sheep / Q000502:physiology*
chemical_list: D006063:Chorionic Gonadotropin; D006064:Gonadotropins, Equine