Study of synchronization and fixed time AI by using progesterone, prostaglandin F sub(2) alpha and hCG or GnRH in variety procedures in beef cow | การศึกษาการเหนี่ยวนำการตกไข่และผสมเทียมแบบกำหนดเวลาโดยการใช้ progesterone ร่วมกับ prostaglandin F sub(2) alpha และ hCG หรือ GnRH รูปแบบต่าง ๆ ในแม่โคเนื้อ
2009
Somchai Sajapitak(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Veterinary Medicine. Department of Large Animals and Wildlife Clinical Sciences) E-mail:[email protected] | Adisorn Yawongsa(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Veterinary Medicine. Department of Large Animals and Wildlife Clinical Sciences) | Pipat Arunvipas(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Veterinary Medicine. Department of Large Animals and Wildlife Clinical Sciences)
Study was to evaluate the effects of fixed time artificial insemination (AI) by using progesterone, subsequently given prostaglandin F sub(2) alpha (PGF sub(2) alpha) at progesterone removal and consequent human chorionic gonadotropin (hCG) or gonadotropin-releasing hormone (GnRH) in variety procedures injection concurrent with fixed time AI to synchronize ovulation 56 h later PGF sub(2) alpha injectation in 78 cross-bred Indu Brazil beef cows in lactation number 2. The cows were divided into 4 groups: Gr. 1-control group 11 cows, Gr. 2-GnRH synthesis 14 cows, Gr. 3-GnRH natural 34 cows, Gr. 4-hCG 19 cows, respectively. Pregnancy was confirmed by rectal palpation 90 d after AI were higher effected (P LT 0.05) in cows given GnRH natural (28/34, 82.35 percent) and hCG (16/19, 84.21 percent) than in the control group while was not effected (P GT 0.05) by treatment with GnRH synthesis (4/14, 28.57 percent). These results suggested that pregnancy following fixed time AI were affected by injection of GnRH natural and hCG in beef cows (P LT 0.05) but was not significantly affected (P GT 0.05) by treatment with GnRH synthesis to stimulate ovulation.
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