The Effect of Delayed Human Chorionic Gonadotropin (hCG) Injection on Superovulation Yield of Dairy Cows Imam Mustofa Laboratory of Veterinary Obstetrics , Faculty of Veterinary Medicine, Universitas Airlangga, Kampus C Unair, Jl. Mulyorejo, Surabaya-60115 Tel. +62-31-5992377, Fax. +62-31-5993015, email :
[email protected] Abstract The purpose of this study was to determine the ovulation rate due to the use of different time of hCG injection on superovulation dairy cows. Forty Friesian Holstein dairy cows were divided into four groups and injected with 0, 500, 750, and 1000 IU PMSG respectively. Five cows of each group were injected of 1500 IU hCG at the time of oestrus, and the other cows were injected o the same dose at the time of insemination. The result revealed that the number of ovulation was significantly increased (p<0.05) begin on 1000 IU PMSG dose in hCG injecting at the time of insemination compared to injecting at the time of oestrus. Key words : PMSG and hCG, time of oestrus, time of insemination References Arthur, G.H., D.E. Noakes and H. Pearson. 1989. Veterinary Reproduction and Obstetrics. 6th ed. Bailliere and Tindall. Hafez, E.S.E. 1993. Reproduction in Farm Animals. 6th Ed. Philadelphia.
Lea and Febiger.
Kaneko, H., G. Watanabe, K. taya and S. Sasamoto. 1992. Changes in Pheripheral Levels of Bioactive and Immunoreactive Inhibin, Estradiol-17β, Progesterone, Luetnizing Hormone, and Follicle Stimulating Hormone Assaciated with Follicular Development in Cows Induced to Superovulate with Equine Chorionic Gonadothropin. Biol Reprod. 47 (1): 76-82. Restiadi, T.I., L. Mahaputra and I. Mustofa. 1996. The Effect of PMSG Injection on Superovulation in Heifers. Vet.Med.J. 12 (2) : 109-114.
Retyped from the archive: Media Kedokteran Hewan (MKH) / Veterinary Medicine Journal (Med.vet.J.) Vol.15 No.4. December 1999, page:242-247. Full text: http://prof_dr_imam-mustofa-fkh.web.unair.ac.id/
