تأثیر امتیاز وضعیت بدنی بر برخی پارامترهای بیولوژیکی خون و عملکرد تولید مثلی میش‌های افشاری
محورهای موضوعی : پژوهش های بالینی دام های بزرگ
کلید واژه: میش‌های افشاری, نمره وضعیت بدن, عملکرد تولید مثل, برخی پارامترهای بیولوژیکی خونی,
چکیده مقاله :
در این مطالعه تاثیر امتیاز وضعیت بدنی (Body Condition Score) و وزن بدن در زمان جفت گیری بر عملکرد تولید مثلی میش های افشاری مورد مطالعه قرار گرفت. تعداد 162 میش افشاری 3 تا 7 ساله به طور تصادفی از واحد گوسفندداری دانشگاه زنجان انتخاب شدند. میش ها از نظر BCS به 4 گروه 2 ، 5/2 ، 3 و 5/3< تقسیم شدند. پارامترهای تولید مثلی نظیر تعداد بره متولد شده به میش های جفت گیری کرده ، بره های متولد شده به میش های زایمان کرده، کیلو گرم بره متولد شده به میش های جفت گیری کرده ، طول دوره آبستنی ، وزن تولد بره ها و برخی از متابولیت های خون مانند گلوکز ، پروتئین ، آلبومین و گلوبولین تعیین شد. نتایج این تحقیق نشان داد که BCS اثر معنی داری بر بره های متولد شده به میش های جفتگیری کرده داشت(p<0.05). میش های با امتیاز بدنی 3 عملکرد تولید مثلی بهتر و کیلو گرم بره متولد شده بیشتری را تولید نمودند. در حالی که بره زایی در میش های با امتیاز بدنی 5/3< کاهش یافت. طول دوره فحلی در میش های با امتیاز وضعیت بدنی 3 طبیعی بود در حالی که در طول دوره فحلی در میش های با BCSبرابر 2 و5/2 کوتاهتر بود. وزن تولد بره ها به عامل وزن بدن مادران وابسته وتحت تاثیر قرار گرفت(p<0.05) اما BCS اثر معنی داری بر وزن تولد و شیرگیری بره ها نداشت. امتیاز وضعیت بدنی اثر معنی داری بر غلظت پلاسمایی FSH و متابولیت های سرم خون نداشت. نتایج این تحقیق نشان داد که BCS اثر معنی داری بر بره های متولد شده به میش های جفتگیری کرده داشت(p<0.05). امتیاز وضعیت بدنی برابر3 در زمان جفت گیری سبب افزایش سوددهی از طریق بهبود عملکرد تولید مثلی گوسفندان افشاری شد.
The effect of body condition score (BCS) and body weight of fat tail Afshari sheep at mating time on reproductive performance were studied . Total 162 fat tail Afshari ewes (3-7 years old) randomly selected from animal unit of Zanjan University. Ewes divided to 4 treatments groups according BCS (2, 2.5, 3, 3.5 and more). The reproductive parameters such as lambs born to ewes after mating, number of lambs born per lambing, Kg lambs born per ewe mating, pregnancy period , lambs birth weight, and some blood metabolites such as glucose, total protein, albumin and globulin were determined. The result of this study indicated that BCS had a significant effect (P<0.05) on the lambs born per ewe at mating. Ewes with BCS =3 had a better performance in lambing rate and Kg lambs born per ewe. While the lambing rate reduced in ewes with BCS of 3.5 or more. Ewes with BCS=3 had more (P<0.05) normal estrous while ewes with low BCS had shorter estrous period. Birth weight of lambs was significantly affected by body weight of their dams (P<0.01) but BCS had no significant effect on lambs’ weight at birth and weaning. There was significant effect of BCS on plasma FSH concentration in ewes with BCS more than 3 but no significant differences was seen in blood metabolite parameters in this study. It is concluded that BCS had significant effect on lambing rate and lambs born per ewe (P<0.05). The BCS of 3 at mating time could optimize profitability of Afshari ewes.
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