کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8981188 | 1108143 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of Intramuscular Injections of Vitamin B12 on Lactation Performance of Dairy Cows Fed Dietary Supplements of Folic Acid and Rumen-Protected Methionine*
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
ECMTHFSAM5-methyl-tetrahydrofolate - 5-متیل تتراهیدروفلواتS-adenosylmethionine - اس-ادنوزیل متیونینFolic acid - اسید فولیکtetrahydrofolate - تتراهیدروفولاتenergy-corrected milk - شیر اصلاح شده با انرژیLactation - شیردهیrumen-protected methionine - متیونین محافظت شده از شکمبهvitamin B12 - ویتامین ب۱۲
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of Intramuscular Injections of Vitamin B12 on Lactation Performance of Dairy Cows Fed Dietary Supplements of Folic Acid and Rumen-Protected Methionine* Effects of Intramuscular Injections of Vitamin B12 on Lactation Performance of Dairy Cows Fed Dietary Supplements of Folic Acid and Rumen-Protected Methionine*](/preview/png/8981188.png)
چکیده انگلیسی
The experiment was undertaken to determine the effects of i.m. injections of vitamin B12 on lactational performance of primiparous dairy cows fed dietary supplements of folic acid and rumen-protected methionine from 4 to 18 wk of lactation. Fourteen primiparous Holstein cows were assigned to 7 blocks of 2 cows each, according to milk production during the third week of lactation. All cows were fed a basal diet supplemented daily with rumen-protected methionine (18Â g of supplement, to bring the estimated supply of methionine to 2.2% of metabolizable protein) plus folic acid (4Â mg per kg of BW). Within each block, the cows received a weekly i.m. injection (2Â mL) of saline or 10Â mg of vitamin B12. Milk production was recorded daily. Milk and blood were sampled every 2 wk. Supplementary vitamin B12 increased energy-corrected milk from 25.8 to 29.0 (SE 1.6) kg/d, as well as milk yields of solids [3.52 to 3.90 (SE 0.22) kg/d], fat [0.87 to 1.01 (SE 0.06) kg/d], and lactose [1.48 to 1.64 (SE 0.11) kg/d]. Supplementation also increased concentrations and amounts of vitamin B12 secreted in milk but had no significant effect on dry matter intake and concentrations and amounts of folates in milk. Packed cell volume, blood hemoglobin, and serum vitamin B12 were increased by supplementary vitamin B12, whereas serum methylmalonic acid was decreased. Serum concentrations of sulfur amino acids were unchanged by treatment. These findings support the hypothesis that, in early lactation, supply of vitamin B12 was not optimal and limited the lactation performance of the cows.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 88, Issue 2, February 2005, Pages 671-676
Journal: Journal of Dairy Science - Volume 88, Issue 2, February 2005, Pages 671-676
نویسندگان
C.L. Girard, J.J. Matte,