تأثیر نمره شرایط بدنی بر تولید و ترکیب شیر در گاوهای شیری آمیخته

Subject Areas : Camel

م.ای.  حسین ¹ (Department of Animal Science and Nutrition, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)
تی.  چندا ² (Department of Dairy and Poultry Science, Faculty of Animal Science and Veterinary Medicine, Patuakhali Science and Technology University, Patuakhali, Bangladesh)
جی.کا.  دبناث ³ (Department of Dairy and Poultry Science, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)
م.م.  حسن ⁴ (Department of Physiology, Pharmacology and Biochemistry, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)
آ.اچ.  شایکات ⁵ (Department of Physiology, Pharmacology and Biochemistry, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)
م.آ.  هکو ⁶ (Department of Physiology, Pharmacology and Biochemistry, Faculty of Veterinary Medicine, Chittagong Veterinary and Animal Science University, Khulshi, Chittagong, Bangladesh)

Received: 2013-09-27 Accepted : 2013-11-16 Published : 2015-06-01

Keywords: تولید شیر, ترکیبات شیر, تأثیر نمره شرایط بدنی, گاو شیری آمیخته,

Abstract :

این مطالعه بر روی 120 گاو شیری آمیخته هلشتاین فریزین در طی یک دوره 150 روزه در میانه دوره شیردهی صورت گرفت و هدف از اجرای آن کمی­سازی تأثیر نمره شرایط بدنی (BCS) بر تولید و ترکیب شیر بود. از 12 مزرعه پرورش گاو شیری با شرایط پرورشی یکسان استفاده شد. در هر یک از این دو مزرعه حداقل 20 گاو شیری آمیخته که در میانه دوره شیردهی بودند، در این مطالعه استفاده شد. تأثیر نمره شرایط بدنی انفرادی گاوها در مقیاس 1 تا 5 رکورد برداری گردید. از هر گاو به صورت انفرادی نمونه شیر گرفته شد. نمونه­های جمع­آوری شده از گاوهای با BCS مشابه با یکدیگر مخلوط شدند تا نمونه مرکب به دست آید. آنالیزهای شیمیایی نمونه­ها برای چربی، پروتئین، لاکتوز، خاکستر، ماده خشک کُل (TS) و ماده خشک غیر چربی (SNF) سه بار صورت گرفت. نتایج نشان داد که BCS تأثیر معنی ­داری بر تولید شیر، چربی شیر و خاکستر شیر در گاوهای شیری آمیخته هلشتاین فریزین دارد (05/0>P). بالاترین تولید شیر (80/1±45/13) در تأثیر نمره شرایط بدنی‌های متوسط (0/3) رکورد برداری شده و پس از آن مقادیر کمتر (75/2 تا 25/2) و بیشتر (25/3 تا 00/4) قرار می­گرفتند. افزایش پروتئین، لاکتوز، TS، SNF و گرانروی مخصوص (SG) همگام با با افزایش BCS تا 4 معنی ­داری نبوده است (05/0<P). ماتریس ضرایب همبستگی نشان داد که BCS با تولید شیر همبستگی منفی دارد. ولی همبستگی بین BCS و پروتئین، لاکتوز، TS، SNF و SG شیر مثبت بوده ولی شدت این رابطه متغیر بوده است.

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