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不同水平蛋氨酸铜对肉牛营养物质消化率的影响

作者：

Zhang Ya

关键词：

cu;diet;digestibility;p0;nutrient digestibility;me

摘要：

试验采用4×4拉丁方设计,选用4头年龄2.5～3岁、平均体重(420±20)kg装有永久性瘤胃瘘管的西门塔尔阉牛,以DL-蛋氨酸螯合铜为铜源,以混合精料和风干玉米秸秆为基础日粮,研究在1.3倍维持水平下,日粮添加不同水平的铜(0,8,16,24mg/kg干物质)对肉牛营养物质消化率的影响。结果表明,8mg/kg组粗脂肪(EE)的消化率最好,差异不显著(P>0.05);16mg/kg组无氮浸出物(NFE)的消化率极显著高于对照组(P﹤0.01);24mg/kg组有机物(OM)、粗蛋白(CP)、粗纤维(CF)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)的消化率最好,其中粗蛋白(CP)的消化率显著高于对照组(P﹤0.01)。日粮中添加24mg/kg干物质的铜可显著改善日粮营养物质消化率,建议以DL-蛋氨酸螯合铜为铜源时日粮加铜24mg/kg。

译名：

Effects of Different Met-Cu Levels on the Nutrient Digestibility of Steer

作者：

ZHANG Yan,et al (College of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201,China)

关键词：

DL-met-Cu; steer; nutrient;digestibility

摘要：

According to 4×4 latin square design, four 2.5～3 years old Simmnental steers with average body weight of (420±20) kg and equipped with permanent ruminal cannulas were selected in the experiment. With DL-met-Cu as Cu source and mixed concentrates and air dried corn stalks as basal diet, the effects of adding Cu on different levels (0, 8, 16 and 24 mg/kg dry matter) in diet on the nutrient digestibility of steers were studied on 1.3 M nutrition level. The results showed that the digestibility of crude fat in the group of 8 mg/kg was best and had no significant difference (P>0.05),the digestibility of no-nitrogen extracts in the group of 16 mg/kg was extemely significantly higher than that of the controlled group (P<0.01). The digestibilities of OM, CP, CF, NDF and ADF in the group of 24 mg/ kg were best, in whch the digestibility of CP was extremely significantly higher than that of the controlled group (P<0.01).The addition of 24 mg/kg dry Cu in diet could significantly improve the nutrient digestibility of diet. It was suggested that with DL-met-Cu as Cu source, the diet should be added with 24 mg/kg Cu.

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不同水平蛋氨酸铜对肉牛营养物质消化率的影响

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