Seminal plasma does not advance ovulation in hCG-treated sows.
In gilts, seminal plasma treatment before or during the LH-surge has been found to advance ovulation in all animals by as much as 8 to 14 h. Two experiments were performed to assess whether such an advancement occurs in multiparous sows in which ovulation is induced by 750 i.u. hCG at 68 h after weaning. In both experiments, seminal plasma was inseminated at 4, 5 and 6 h after hCG (7 and 6 sows, respectively) and control sows (6 and 6 sows, respectively) were not inseminated. In Experiment 1, using Meishan semen, all sows ovulated between 38 and 44 h after hCG; no advancement of ovulation was seen due to treatment. In Experiment 2, using GY seminal plasma, 3 and 4 sows, respectively had started ovulation at 44 h after hCG. Again, no advancement of ovulation was seen due to treatment. Therefore, in both experiments, seminal plasma treatment within 4-6 h after hCG failed to advance ovulation to a similar extent as found in spontaneously ovulating gilts. It is unclear what causes this lack of effect. Maybe seminal plasma treatment does not advance hCG-induced ovulation or batches of seminal plasma differ in their ovulation-advancing properties.
Soede
N M
NM
Wageningen Institute of Animal Sciences, Wageningen Agricultural University, The Netherlands. nicoline.soede@genr.vh.wau.nl
Bouwman
E G
EG
Kemp
B
B
D000818:Animals; D006063:Chorionic Gonadotropin / Q000008:administration & dosage*; D004971:Estrus; D005260:Female; D008297:Male; D010062:Ovulation Induction / Q000379:methods / Q000662:veterinary*; D012661:Semen / Q000502:physiology*; D013552:Swine / Q000502:physiology*; D013997:Time Factors
D006063:Chorionic Gonadotropin