The Net Energy System for Dairy Cows

机译：奶牛的净能源系统

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Because the composition of the total diet affects digestibility and metabolism,feedstuffs do not have net energy for lactation (NEL) values,only diets have NEL.Accurate estimates of NEL balance (intake minus use) are extremely important in dairy nutrition-it allows appropriate management of body condition of cows.Digestibility of NDF averages about 50％ but is highly variable.It is affected by lignin concentration but it also tends to decrease as starch concentration and starch digestibility increases.Digestibility of starch averages about 90％ and is variable but less so than NDF digestibility.Physical processing,grain species,and maturity of the grain are the major factors affecting digestibility.Nutritionists should not hesitate to adjust computer model generated NEL values based on experience,total diet composition,and feed intake of the cows.

机译：由于总饮食的组成会影响消化率和代谢，饲料中没有乳酸的净能量（NEL），只有饮食具有NEL。准确估计NEL的平衡（摄入量减去使用量）在乳制品营养中非常重要-它允许NDF的消化率平均约为50％，但变化很大。它受木质素浓度的影响，但随着淀粉浓度和淀粉消化率的增加而趋于下降。淀粉的消化率平均为90％，并且变化不定。谷物的物理加工，谷物种类和成熟度是影响消化率的主要因素。营养学家应毫不犹豫地根据经验，总饲料组成和奶牛摄入量调整计算机模型生成的NEL值。

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《4th international symposium on dairy cow nutrition and milk quality proceedings》|2015年|147-153|共7页
会议地点 Beijing(CN)
作者
William P.Weiss;
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Department of Animal Sciences Ohio Agricultural Research and Development Center The Ohio State University;

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原文格式 PDF
正文语种 eng
中图分类乳产品综合利用;
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4. The Net Energy System for Dairy Cows [C] . William P.Weiss International symposium on dairy cow nutrition and milk quality . 2015

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The Net Energy System for Dairy Cows

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