代乳料中脂溶性維生素和礦物質狀態(tài)對反芻前生長速度的影響

牧童

Effects of growth rate on fat-soluble vitamin and macro- and micromineral concentrations in the circulation of preruminant dairy calves were evaluated. Dietary treatments were designed to achieve 3 targeted rates of gain [no growth (NG)=0.0 kg/d; low growth (LG)=0.55 kg/d; or high growth (HG)=1.2 kg/d] over a 7-wk period. Milk replacer (MR) intakes necessary to achieve these growth rates were estimated using the National Research Council's Nutrient Requirements of Dairy Cattle calf model computer program. All of the calves were fed a 30% crude protein, 20% fat MR reconstituted to 14% dry matter. The diets were formulated to ensure that protein was not a limiting nutrient. No-growth and LG calves were supplemented additionally with vitamins A, D, and E to compensate for treatment differences in dry matter intake relative to the HG calves; however, no attempt was made to adjust mineral intake based on MR consumption. Growth rates for NG (0.11 kg/d), LG (0.58 kg/d), and HG (1.16 kg/d) calves differed during the study. Health was minimally affected by growth rate and this was reflected by comparable and relatively low serum haptoglobin concentrations in all calves during the 7-wk period. Concentrations of serum retinol, 25-(OH)-vitamin D3, and zinc were unaffected by growth rate. The HG calves had lower RRR-α-tocopherol concentrations than NG and LG calves at wk 7, suggesting that the increased growth rate of HG calves was associated with increased utilization of vitamin E. Serum concentrations of all vitamins increased with age. Copper, calcium, and phosphorous concentrations in HG calves exceeded those in LG and NG calves during the latter weeks of the study, likely because of increased MR intake by HG calves. Fat-soluble vitamin and mineral concentrations for all treatment groups remained within ranges considered normal for preruminant calves.

牧童

牧童老師，您這也太難為大家了吧
yangshizhu 發(fā)表于 2010-5-27 15:27

真的沒有時間為大家翻譯稱中文，只是給大家報道一下這個資料，覺得有價值啊

southlaker

文章的出處是哪里？

longmeier1945

暈！這是哪的文章，還不如去找原文呢!

牧童

暈！這是哪的文章，還不如去找原文呢!
longmeier1945 發(fā)表于 2010-6-9 16:50

呵呵，還真的忘記了出處

泰山小虎

英語水平不好，希望中文版本！

花花好

內容還可以，和我們的制作上還有差距。