摘要
谷物饲料干物质中的淀粉含量多在50%以上,全株玉米青贮的淀粉含量亦有30%。牛的玉米日粮生淀粉消化率比熟淀粉低,但熟淀粉由于瘤胃消化率很高,所以瘤胃后的可消化淀粉量很低。生糖前体能量(瘤胃丙酸+肠可消化淀粉)能明显提高产奶量和乳蛋白率,但导致乳脂率下降。须对生糖前体能量进行评定和调节,以提高产奶效率。对真胃灌注不同梯度的葡萄糖或淀粉均显着地提高了Kf和体脂肪及体蛋白质沉织,因此我国肉牛饲养标准提出的Kf(%)=11.7645+55.756(IDOM/FNDF)仍适用,但可进一步增加IDOM中的淀粉调控。
Most of cereals contain more than 50% of starch. The whole corn silage contains 30% of starch： The ruminal digestibility of starch in ground maize of diets is around 50% and the steam flaked maize is higher but a lesser starch in postrumen. Evaluating the net energy of feeds for milk production was from the research and an equation has been derived , the milk production could be influenced significantly by the energy provided glucogenic precursors from the rumen（propionic acid） and the intestine（glucose）, the assessment of glucogenic precursor is better to be involved in the evaluation of NEL. From the research results of beef cattle by the infusion of starch and glucose in the abomasum, also an equation has been derived： Kf（%） =11. 764 5 ＋ 55. 756（IDOM/FNDF）, r = 0. 981, n= 10 ,P〈0.01 ,IDOM= The digestible starch ,protein and fat in the intestine. FNDF -- Fermentable NDF in the rumen.
出处
《动物营养学报》
CAS
CSCD
北大核心
2008年第1期115-122,共8页
CHINESE JOURNAL OF ANIMAL NUTRITION
关键词
奶牛
肉牛
葡萄糖
淀粉
营养调控
评定
Dairy cattle
Beef cattle
Glucose
Starch
Nutritive evaluation
