اثر زمانهای مختلف تغذیه روی عملکرد گاوهای شیری دو‌رگه در طی تنش گرمایی تابستان
Subject Areas : Camelم. گول 1 , آی. احمد 2 , ر. خان 3 , اس. ام سهیل 4 , اس. اختر 5 , آ. رحمان 6 , آ. ایجاز 7 , آ. گوهر 8
1 - Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan
2 - Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan
3 - Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science,
University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan
4 - Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science,
University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan
5 - Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan
6 - Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan
7 - Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan
8 - Government Cattle Breeding and Dairy Form Harichand, Charsadda, Pakistan
Keywords: ترکیب شیر, زمان تغذیه, مالون دی‌آلدئید, استراتژی کاهش, تنش تابستان,
Abstract :
بخش پرورش حیوانات اهلی در پاکستان یک موقعیت بینظیر را در توسعه اقتصاد ملی این کشور شامل میشود. مطالعه حاضر برای ارزیابی به کارگیری استراتژی کاهش استرس گرما از طریق استفاده از زمانهای مختلف تغذیه روی صفات عملکردی تولید و ترکیب شیر و خصوصیات فیزیکوشیمیایی آن در گاوهای شیری در طی فصل تابستان انجام شد. بیست رأس گاو هلشتاین فریزین به طور تصادفی در چهار گروه تیماری (G1: 80/20، G2: 50/50،G3 : 100/0 وG4 : 0/100؛ از نسبتهای روز به شب) تقسیم شدند. تولید و ترکیب شیر و خصوصیات فیزیکوشیمایی آن و سطح مالوندیآلدئید در سرم خون تعیین شدند. نتیجهگیری اینکه تغییرات در زمان تغذیه، به طور معنیداری تولید شیر را در گروههایی که در بخش خنکتر روز تغذیه میکردند افزایش داد. ترکیب شیر و خصوصیات فیزیکوشیمیایی آن نیز از نوسانات تغذیه در زمانهای صبح و عصر تأثیر پذیرفتهاند. بنابراین، تغییر در زمان تغذیه در طی فصل تابستان در نواحی گرم یک روش عملیاتی مناسب برای بر طرف نمودن اثرات تنش گرمایی روی عملکرد تولیدی گاوهای شیری است.
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