اثر زمان‌های مختلف تغذیه روی عملکرد گاوهای شیری دو‌رگه در طی تنش گرمایی تابستان

Subject Areas : Camel

م.  گول ¹ (Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan)
آی.  احمد ² (Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan)
ر.  خان ³ (Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan)
اس. ام  سهیل ⁴ (Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan)
اس.  اختر ⁵ (Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan)
آ.  رحمان ⁶ (Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan)
آ.  ایجاز ⁷ (Department of Livestock Management, Breeding and Genetics, Faculty of Animal Husbandry and Veterinary Science, University of Agriculture Peshawar, Khyber Pakhtunkhwa, Pakistan)
آ.  گوهر ⁸ (Government Cattle Breeding and Dairy Form Harichand, Charsadda, Pakistan)

Received: 2015-05-11 Accepted : 2015-08-15 Published : 2016-06-01

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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