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بررسی تأثیر جیره ای بتائین و تزریق ویتامین 12B در دورۀ انتقال بر الگوی اسیدهای چرب شیر در گاوهای شیری هلشتاین

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکدۀ کشاورزی، دانشگاه لرستان

2 دانشیار، دانشکدۀ کشاورزی، دانشگاه لرستان

3 استادیار، دانشکدۀ کشاورزی، دانشگاه لرستان

چکیده

به‌منظور بررسی تأثیر افزودن جیره­ای بتائین و تزریق ویتامین ­12B در دورۀ انتقال بر الگوی اسیدهای چرب شیر از 32 رأس گاو شیری هلشتاین استفاده شد. تیمارهای آزمایشی شامل شاهد یا CC(بدون افزودنی)، تیمار دوم یا CB (افزودن ۵۰ گرم بتائین حفاظت نشده در هر روز به ازای هر رأس دام)، تیمار سوم یا BC (تزریق ده روز یک‌بار 5 میلی­گرم ویتامین 12B) و تیمار چهارم یا BB (افزودن ۵۰ گرم بتائین حفاظت نشده و تزریق ده روز یک‌بار 5 میلی­گرم ویتامین 12B) بودند. نتایج نشان داد، تیمار BC و BB در مقایسه با تیمار CC و تیمار CB سبب افزایش ساخت (سنتز) دنووی اسیدهای چرب در غدۀ پستانی و درصد اسیدهای چرب اشباع شیر شد (05/0>P). تیمارهای آزمایشی بر مجموع اسیدهای چرب غیراشباع با یک پیوند دوگانه و درصد اسید چرب C14:1، C16:1، C18:1n9t، C18:1n9c و C20:1 تأثیری نداشتند (05/0<P). میزان اسیدهای چرب با چند پیوند دوگانه در گاوهای دریافت‌کنندۀ تیمار CB بالاتر از گاوهای BC و BB(05/0>P)، اما همسان با گاوهای گروه CC بود. تیمارهای آزمایشی تأثیری بر درصد چربی شیر و غلظت گلوکز پلاسما نداشتند (05/0>P). بنابراین تزریق درون عضلانی ویتامین ­12B در دورۀ انتقال برای افزایش ساخت دنووی اسیدهای چرب شیر در گاوهای شیری توصیه می­شود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of dietary betaine supplementation and vitamin B12 injection during the transition period on fatty acids profile of milk in Holstein dairy cows

نویسندگان [English]

  • Ali Gohardust 1
  • Arash Azarfar 2
  • Ali Kiani 2
  • Amir Fadayifar 3
1 M.Sc. Student, Department of Animal Sciences, Faculty of Agriculture, Lorestan University, Iran
2 Associate Professor, Department of Animal Sciences, Faculty of Agriculture, Lorestan University, Iran
3 Assistant Professor, Department of Animal Sciences, Faculty of Agriculture, Lorestan University, Iran
چکیده [English]

In this research effects of dietary supplemention with betaine and injection of vitamin B12 during the transition period on profile of milk fatty acids was investigated using 32 Holstein dairy cows. Experimental treatments included control (a basal diet without any supplementation; CC), CB (supplemnting with 50 g of rumen unprotected betaine per day per head during the transition period), BC (injection of 0.5 mg vitamin B12 in a 10-days interval) and CC (supplemnting with 50 g of unprotected betaine per day per head plus injection of 0.5 mg vitamin B12 in a 10-days interval. The CB and BB significantly increased denovo synthesis of fatty acids in mammary gland and milk fat concentration of saturated fatty acids (P<0.05). Experimental treatments had no effect on milk fat concentratios of total mono-unsaturated fatty acids, C14: 1, C16: 1, C18: 1n9t, C18:1n9c and C20:1 (P> 0.05). Milk fat concentration of polyunsaturated fatty acids was higher in cows recived CB than in BC and BB cows, but similar to CC cows. Experimental treatments had no effect on perentage of milk fat and plasma concentration of glucose (P>0.05). In conclusion, to inceraese denovo synthesis of fatty acids in mammary glands intarmuscualr injection of vitamin B12 in transition cows is recommended. 

کلیدواژه‌ها [English]

  • betaine
  • milk fatty acid
  • transition dairy cow
  • vitamin B12
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