不同营养水平日粮对荷斯坦奶公牛育肥效果的影响

Effect of Different Dietary Nutrition Levels on Fattening Effect of Holstein Bulls

试验旨在研究不同营养水平日粮对荷斯坦奶公牛育肥效果的影响。选择4月龄左右、平均体重128kg的健康中国荷斯坦奶公牛48头,随机分成2组,每组24头。Ⅰ组饲喂低营养水平日粮(低能量、低蛋白质),Ⅱ组饲喂高营养水平日粮(高能量、高蛋白质)。预试期7d,正试期245d。结果表明,与Ⅰ组相比,Ⅱ组平均日增重极显著提高6.36%(P<0.01),料重比降低6.55%。随着日粮营养水平的提高,奶公牛粗蛋白质、粗脂肪、中性洗涤纤维、酸性洗涤纤维、钙、磷的表观消化率随之升高,但均未达到显著水平(P>0.05)。与Ⅰ组相比,Ⅱ组血清中葡萄糖、谷草转氨酶、谷丙转氨酶、生长激素含量分别显著提高12.52%、12.85%、9.68%、13.24%(P<0.05),而尿素氮含量显著降低10.98%(P<0.05)。与Ⅰ组相比,Ⅱ组养殖效益多收入1.37元/(头·d),全期效益多收入335.65元/头。综上所述,提高日粮营养水平,可提高奶公牛的育肥性能和经济效益。

This experiment was conducted to study the effect of different dietary nutrition levels on fattening effect of Holstein bulls. 48 4-month-old Holstein bulls with an average body weight of 128 kg were allocated into two groups,group Ⅰ was fed a low nutrition level diet,group Ⅱ was fed a high nutrition level diet. Each group had 24 Holstein bulls. The pre-test period lasted for 7 days and the trial period lasted for 245 days. The results showed that compared with group Ⅰ ,the ADG in group Ⅱ was significantly increased by 6.36% （P〈0. 01） ,while the F/G in group Ⅱ was decreased by 6.55 %. With the increasing of dietary nutrition levels,the apparent digestibility of CP,EE,NDF,ADF,Ca and P were rising,but there was no significant differences between two groups （P〉0. 05）. Compared with group I , the serum GLU, AST, ALT and GH contents in group Ⅱ were increased by 12.52% ,12.85% ,9.68% and 13.24% （P〈0.05） ,respectively,while the serum BUN content in group Ⅱ was decreased by 10.98% （P〈0.05）. Compared with group I ,the feeding profits of group Ⅱ increased by 1.37 yuan/（head · day） ,the total economic bene- fit of group II increased by 335.65 yuan/head. In conclusion,the improvement of dietary nutrition levels could improve the fattening performance and the economic benefit of Holstein bulls.