Effects of Feeding Rumen Protected Choline and Vitamin E on Milk Yield, Milk Composition, Dry Matter Intake, BodyCondition Score and Body Weight in Early Lactating Dairy Cows

محورهای موضوعی : Camel

M. Rahmani ¹ ( Department of Animal Science, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran )
M. Dehghan-Banadaky ² ( Department of Animal Science, Faculty of Agriculture and Natural Resources, University of Tehran, Karaj, Iran )
R. Kamalyan ³ ( Departmentof Biochemistry, Faculty of Veterinary Medicine, Armenian National Agrarian University, Yerevan, Armenia )

تاریخ دریافت : 1392/09/04 تاریخ پذیرش : 1392/11/10 تاریخ انتشار : 1393/09/10

کلید واژه: live weight, feed intake, vitamin E, Cow, choline, milk production,

چکیده مقاله :

Twenty four primiparous and multiparous Holstein cows on early lactation, beginning five weeks postpartum, were used for four weeks to investigate the effects of supplemention of rumen-protected choline (RPC) or vitamin E on milk yield, milk composition, dry matter intake, body condition score and body weight. The cows were randomly assigned to one of the following treatments: I)no supplement (control), II)90 g/d of RPC and III)4400 IU/d of vitamin E. In this study, dry matter intake, body weight, body condition score, milk yield and the contents and yields of all milk constituents, except the content of solid non fat (SNF) for RPC group, were not affected by choline or vitamin E supplementation (P>0.05). The RPC increased (P<0.05) the content of SNF compared with the control and vitamin E groups. The results showed that RPC or vitamin E supplementation into the diets of early lactating dairy cows did not affect dry matter intake, milk yield, milk composition, body condition score and body weight.

چکیده انگلیسی:

به منظور بررسی اثرات مصرف کولین محافظت شده یا ویتامین E بر تولید شیر، ترکیبات شیر، ماده خشک مصرفی، امتیاز وضعیت بدنی و وزن بدن در گاوهای اوایل دوره شیردهی، تعداد 24 رأس گاو هلشتاین یک شکم‌زا و چند شکم‌زا که در هفته پنجم شیردهی قرار داشتند، به مدت چهار هفته مورد آزمایش قرار گرفتند. گاوها به‌ طور تصادفی به یکی از گروه‌های زیر اختصاص یافتند: I- بدون دریافت مکمل (شاهد) II- دریافت کننده کولین محافظت شده (90 گرم در روز) و III- دریافت کننده ویتامین E (4400 واحد بین المللی در روز). در این مطالعه، مصرف کولین یا ویتامین E بر ماده خشک مصرفی، وزن بدن، امتیاز وضعیت بدنی، تولید شیر، درصد و محصول اجزای تشکیل دهنده شیر به غیر از درصد مواد جامد بدون چربی در گروه کولین، تأثیری نداشت (05/0P>). مصرف کولین محافظت شده سبب افزایش درصد مواد جامد بدون چربی شیر در مقایسه با گروه شاهد و گروه ویتامین E گردید (05/0>P). نتایج این آزمایش نشان داد که مصرف کولین یا ویتامین E در جیره گاوهای اوایل دوره شیردهی تأثیری بر تولید شیر، ترکیبات شیر، ماده خشک مصرفی، وضعیت شرایط بدنی و وزن بدن نداشت.

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