Jentsch W, Wittenburg H, Beyer M
Forschungsinstitut für die Biologie landwirtschaftlicher Nutztiere, Rostock, Germany.
Arch Tierernahr. 1992;42(3-4):301-16. doi: 10.1080/17450399209428544.
Rations with energy parts of 50, 25 and 10% from barley, maize and potatoes were investigated comparatively by means of total metabolism experiments with oxen with a view to arriving at a more precise estimation equation of net energy fat for cattle. Parallel to the investigations with oxen the energy and nutrients digestibility of the rations in wethers was measured. The crude fibre content of the rations ranged from 166 to 271 g and the starch content from 69 to 330 g/kg DM. The daily starch intake of the oxen ranged from 575 to 2739 g on nutrition level (NL) 1.7 and from 365 to 1804 g on NL 1.1. The energy digestibility of the rations in oxen with energy parts of 50% barley, maize and potatoes was on average 73.5, 73.9 and 75.3%, of the rations with energy parts of 25% on average 72.2, 71.6 and 72.4% and of the rations with energy parts of 10% on average 68.8, 69.5 and 69.8%. The digestibility of energy and nutrients in cattle and sheep was in good agreement excepted crude protein and crude fat; these were digested 4-5%-units lower from cattle than from sheep. The increase of the nutrition level by one unit lowered the digestibility of rations with energy parts of 50 and 25% from concentrates in cattle about 3-6 units and of rations with energy parts of 10% from concentrates about one %-unit. Information about rumen physiological data is given comparatively between cattle and sheep.
通过对牛进行全代谢实验，比较研究了能量部分分别来自大麦、玉米和土豆且占比为50%、25%和10%的日粮，目的是得出更精确的牛净能脂肪估算方程。在对牛进行研究的同时，还测定了阉羊日粮的能量和养分消化率。日粮的粗纤维含量在166至271克之间，淀粉含量在69至330克/千克干物质之间。在营养水平（NL）1.7时，牛的每日淀粉摄入量在575至2739克之间，在NL 1.1时为365至1804克。能量部分为50%大麦、玉米和土豆的日粮在牛体内的能量消化率平均分别为73.5%、73.9%和75.3%，能量部分为25%的日粮平均分别为72.2%、71.6%和72.4%，能量部分为10%的日粮平均分别为68.8%、69.5%和69.8%。除粗蛋白和粗脂肪外，牛和羊对能量和养分的消化率基本一致；牛对粗蛋白和粗脂肪的消化率比羊低4 - 5个百分点。营养水平每提高一个单位，能量部分为50%和25%的精料日粮在牛体内的消化率降低约3 - 6个百分点，能量部分为10%的精料日粮的消化率降低约1个百分点。文中还比较给出了牛和羊瘤胃生理数据的信息。
