Murphy J J, Kennelly J J
Department of Animal Science, University of Alberta, Edmonton.
J Dairy Sci. 1987 Sep;70(9):1841-9. doi: 10.3168/jds.S0022-0302(87)80223-0.
Degradability of DM and CP was determined in situ for barley, canola meal, corn gluten meal, barley silage, and four concentrate mixtures. Crude protein percent of concentrate mixtures 1 to 4, respectively, were barley plus canola 1, 15.1; barley plus canola 2, 21.0; barley plus corn gluten 1, 17.1; and barley plus corn gluten 2, 19.6. Degradability of each feedstuff was measured on each of four basal diets consisting of barley silage and one of the above concentrate mixtures fed in the proportion 40:60 (DM). The resulting CP percent of diets containing concentrates 1 to 4 were 12.3, 16.1, 13.8, and 16.4. Effective degradability for DM and CP, assuming a rumen outflow rate of .08 h-1, were: barley 77.7 and 79.8; canola meal 60.9 and 66.6; corn gluten meal 18.9 and 11.0; barley silage 47.0 and 81.1; barley plus canola 1, 76.4 and 77.4; barley plus canola 2, 72.5 and 71.8; barley plus corn gluten 1, 72.8 and 55.8; barley plus corn gluten 2, 70.2 and 47.4. With two exceptions (DM degradability of concentrate 4 and CP degradability of concentrate 2), basal diet had no significant effect on effective CP or effective DM degradability. Crude protein degradability of concentrate mixtures 1 to 4, respectively, as measured (77.4, 71.8, 55.8, and 47.4) was similar to degradability estimated on the basis of their ingredient content (75.7, 72.1, 49.6, and 43.0).
对大麦、油菜籽粕、玉米蛋白粉、大麦青贮饲料和四种精料混合料进行了干物质（DM）和粗蛋白（CP）的瘤胃原位降解率测定。精料混合料1至4的粗蛋白含量分别为：大麦加油菜籽1号，15.1%；大麦加油菜籽2号，21.0%；大麦加玉米蛋白粉1号，17.1%；大麦加玉米蛋白粉2号，19.6%。每种饲料原料的降解率是在由大麦青贮饲料和上述一种精料混合料按40:60（干物质）比例组成的四种基础日粮上测定的。含精料1至4号日粮的粗蛋白含量分别为12.3%、16.1%、13.8%和16.4%。假设瘤胃外流速度为0.08 h-1时，DM和CP的有效降解率分别为：大麦77.7%和79.8%；油菜籽粕60.9%和66.6%；玉米蛋白粉18.9%和11.0%；大麦青贮饲料47.0%和81.1%；大麦加油菜籽1号，76.4%和77.4%；大麦加油菜籽2号，72.5%和71.8%；大麦加玉米蛋白粉1号，72.8%和55.8%；大麦加玉米蛋白粉2号，70.2%和47.4%。除两个例外情况（精料4号的DM降解率和精料2号的CP降解率）外，基础日粮对CP或DM的有效降解率无显著影响。精料混合料1至4号的实测粗蛋白降解率分别为（77.4%、71.8%、55.8%和47.4%），与根据其成分含量估算的降解率（75.7%、72.1%、49.6%和43.0%）相似。
