日粮精料中麸皮比例对西门塔尔杂交后备母牛日粮营养物质消化率的影响

Effects of Dietary Concentrates with Different Wheat Bran Proportions on the Nutrients' Apparent Digestibilities in Heifers

文章旨在采用消化试验研究肉牛日粮精料中麸皮比例对日粮营养物质表观消化率的影响。试验选取体况良好、体重一致(369.5 kg±37.8 kg)的杂交后备母牛(西门塔尔牛(♂)×中国黄牛(♀))24头,随机分为6组,即试验Ⅰ组、Ⅱ组、Ⅲ组、Ⅳ组、Ⅴ组和Ⅵ组,每组4头,分别定量饲喂6种不同麸皮水平的精料日粮(3.5kg/d),粗料(青贮)自由采食;各试验组精料麸皮水平分别为0%、10%、20%、30%、40%和50%;预饲期20 d,试验期30 d,试验最后7 d收集全部粪样。结果表明:日粮精料中麸皮水平对日粮有机物(OM)、粗蛋白质、淀粉和中性洗涤纤维(NDF)的消化道表观消化率没有显著影响(P>0.05),不同麸皮水平日粮的OM、CP、淀粉和NDF的消化道表观消化率变化范围分别为49.40%～55.52%、48.56%～53.90%、88.87%～93.29%、48.11%～57.91%。

The objective of this study was to determine the effects of dietary concentrates with different wheat bran proportions on the nutrients＇ apparent digestibilities in heifers.The proportions of wheat bran in six treatments were 0 %,10 %,20 %,30 %,40 % and 50 %,respectively.The diets were fed to 24 heifers of Simmental cross（Simmental ×Chinese yellow cattle） for 2 months.All feces were collected using the direct collection during the last week.The results showed that the apparent digestibilites of organic matter,crude protein,starch,NDF had no significant differences among different treatments（P0.05）.The total tract digestibilities of organic matter,crude protein,starch and NDF were 49.40 %～55.52 %,48.56 %～53.90 %,88.87 %～93.29 % and 48.11 %～57.91 %,respectively.