Delayed Ovarian Cyclicity Does not Reflect Blood Metabolites Irregularity in Postpartum Holstein Cows
محورهای موضوعی : Camel
1 - Department of Theriogenology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
کلید واژه: progesterone, blood metabolites, postpartum cows, reproductive indices,
چکیده مقاله :
An experiment was conducted to investigate the effect of different types of ovarian cycles on reproductive indices and blood metabolites in 61 Holstein cows. Blood samples were taken from each cow between day 12 and day 50 postpartum (PP). Serum progesterone concentrations were measured to determine the onset of luteal function and different types of luteal dysfunctions in cows. Serum glucose, cholesterol and blood urea nitrogen concentrations were measured in the cows with normal and abnormal ovarian cyclicity. In this study, 29 (47.5%) cows showed normal ovarian cyclicity with first luteal activity detected before day 50 days PP, whereas 32 (52.5%) cows showed abnormal cyclicity. Of the 32 cows with abnormal patterns, 13 (21.3%) had prolonged luteal phase (PLP), 7 (11.5%) had short luteal phase (SLP) and 12 (19.7%) had delayed first ovulation (delayed ovulation).Progesterone concentration at different times was considerably varied from day to another day (P≤0.01), while the main effect of the group on the progesterone concentration was significant (P≤0.01). Cows that had normal cyclicity showed earlier luteal activity (P≤0.01) and shorter interval to first ovulation (P≤0.01) compared to cows with abnormal cyclicity. There were no significant differences in different blood metabolites between cows with normal or abnormal cyclicity. In conclusion, a high percentage (52.5%) of the postpartum cows had abnormal ovarian cycles. The abnormal ovarian cycles reduced the reproductive performance of dairy cows, including the onset of luteal activity and interval to first ovulation. Blood metabolites were not associated with postpartum abnormal cycles in cows.
به منظور بررسی اثر انواع مختلف چرخههای تخمدانی بر شاخصهای باروری و متابولیتهای خونی، آزمایشی بر روی 61 گاو هلشتاین انجام شد. از هر رأس گاو بین روز 12 و روز 50 پس از زایش (PP) نمونه خون گرفته شد. غلظت پروژسترون سرم برای تعیین شروع عملکرد لوتئال و انواع مختلف اختلالات لوتئال در گاو اندازهگیری شد. غلظت گلوکز، کلسترول و نیتروژن اورهای خون در گاوهای با چرخههای طبیعی و غیر طبیعی تخمدان اندازهگیری شد. در این مطالعه، 29 رأس گاو (5/47 درصد) چرخه تخمدانی طبیعی را در اولین فعالیت لوتئال شناسایی شده قبل از روز 50 PP نشان دادند، در حالیکه 32 رأس گاو (5/52 درصد) چرخه غیر طبیعی را نشان دادند. از 32 رأس گاو مبتلا به الگوهای غیر طبیعی، 13 رأس (3/21 درصد) فاز لوتئال طولانی مدت (PLP)، 7 رأس (5/11 درصد) فاز لوتئال کوتاه (SLP) و 12 رأس (7/19 درصد) تأخیر در اولین تخمکگذاری (با تأخیر تخمکگذاری) داشتند. غلظت پروژسترون در زمانهای مختلف، به طور قابل توجهی از روزی به یک روز دیگر (01/0P≤) متنوع بود، در حالیکه اثر اصلی این گروه بر غلظت پروژسترون معنیدار بود (01/0P≤). گاوهایی که چرخه طبیعی داشتند فعالیت لوتئال زودتر (01/0P≤) و فاصله اولین تخمکگذاری کوتاهتری (01/0P≤) در مقایسه با گاوهای با چرخه غیر طبیعی نشان دادند. اختلاف معنیداری در متابولیتهای خونی مختلف بین گاوهای با چرخه طبیعی یا غیر طبیعی وجود نداشت. نتیجهگیری میشود که، درصد بالایی (5/52 درصد) از گاوها پس از زایش، چرخه غیر طبیعی تخمدان داشتند. چرخههای غیر طبیعی تخمدان سبب کاهش عملکرد تولید مثلی گاوهای شیری، از جمله شروع فعالیت لوتئال و فاصله اولین تخمکگذاری میشود. متابولیتهای خون با چرخه غیر طبیعی پس از زایش در گاو ارتباط نداشتند.
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