Effect of Human Chorionic Gonadotropin on Late Embryonic Death in Holstein Dairy Cows

سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 145

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شناسه ملی سند علمی:

JR_JOAVM-5-14_003

تاریخ نمایه سازی: 15 فروردین 1402

چکیده مقاله:

Background and aim: The objective of this study was to determine whether administration of ۱۵۰۰ IU of hCG on Day ۲۹±۱ after artificial insemination (AI) would reduce pregnancy loss by inducing accessory corpora lutea and increasing serum progesterone concentrations in dairy cattle. Materials and Methods: Three hundred and seventy lactating Holstein dairy cows from a farm with ۱۲۰۰ lactating cows were randomly assigned to a treatment and a control group. The animals of the treatment group (n=۱۸۵) received hCG ۱۵۰۰ IU (IM), while in the control group they received the control group (n=۱۸۵) received no treatment. Ovarian structures, serum progesterone levels and pregnancy status were determined on days ۲۹±۱ and ۴۲, respectively. Results: The Progesterone concentration on day ۴۲ was higher (P=۰.۰۰۵) for cows in the hCG group (۱۴.۹±۰.۷ mg/ml) compared to the control group (۱۲.۱±۰.۷ng/ml). On day ۴۲, the number of accessory CLs  for cows in the hCG group (۱.۶±۰.۰۴) were higher (p˂۰.۰۰۰۱) than cows in the control group (۱.۲±۰.۰۴). A Positive correlation was detected between the circulating progesterone and CL volume in the hCG group (r=۰.۴۷, p=۰.۰۰۱). Pregnancy losses did not differ between days ۲۹±۱ and ۴۲ both in the control (۷.۶%) and in the hCG group (۵.۹%). Conclusion: It was concluded that the administration of hCG (۱۵۰۰ IU) on day ۲۹±۱ of pregnancy in lactating dairy cows increased the number of corpora lutea and serum progesterone concentration but did not have any effect on pregnancy loss rate or pregnancy losses.

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نویسندگان

نوید اعرابی

Department of clinical Science, School of Veterinary Medicine, Kazerun Branch, Islamic Azad University, Kazerun, Iran

امیراشکان مهجور

Department of Pathobiology School of Veterinary Medicine, Kazerun Branch, Islamic Azad University, Kazerun, Iran

عباس روشن قصرالدشتی

Department of clinical Science, School of Veterinary Medicine, Kazerun Branch, Islamic Azad University, Kazerun, Iran

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