[Induction of post-partum ovulation in creole cows by using a Norgestomet implant and temporary removal of the calf].
Two treatments were used to attempt to induce ovulation in anoestrous post-partum creole cows. The use of a Norgestomet implant for 7 days followed by removal of the calf for 48 h induced ovulation in 91, 83 and 71% of anoestrous creole cows treated respectively at 37, 48 and 51 days post partum (implant insertion). In the same time, the cycling rates of the control groups were 30, 35 and 35%, respectively. But calf removal for 48 h at 60 and 80 days without progestagen priming failed to increase the number of cycling cows compared to the control group. Whatever the treatment and the post-partum day, calf growth was not different between the treated and the control groups at 30, 60 and 90 days post-partum, and there was no mastitis.
D000818:Animals; D002417:Cattle; D004343:Drug Implants; D005260:Female; D010062:Ovulation Induction / Q000379:methods / Q000662:veterinary*; D049590:Postpartum Period; D011247:Pregnancy; D011282:Pregnenediones / Q000008:administration & dosage*; D014886:Weaning
D004343:Drug Implants; D011282:Pregnenediones; C100284:norgestomet
Induction d'une ovulation post-partum chez la vache créole à l'aide d'une séparation temporaire du veau et de l'utilisation préalable d'un implant de Norgestomet.