【摘要】 试验用Ｌ４（２３）型正交法，比较了在饲喂以小麦秸秆为主的粗饲料条件下，常量元素（钾、镁、硫）、微量元素、促生长素３种添加剂的复合及其各自的效果。每组３头牛，每个处理６头牛。通过６０ｄ试验观察，饲料中添加微量元素可以提高增重２３．８９％，降低饲料消耗１６．１８％；添加促生长剂提高增重２１．２８％，降低饲料消耗１４．８２％。经生物统计分析，差异显著（Ｐ＜０．０５）。添加常量元素有效果，但不明显，分别为３．４０％、１．７０％。经试验，用微量元素和促生长剂组成复合添加剂预混料的２组较不喂者可提高增重５１．９９％（Ｐ＜０．０１），单位增重饲料消耗减少２８．３３％；用促生长剂和常量元素组成预混料的３组与微量元素和常量元素预混料的４组较不喂者均能提高增重和减少单位增重饲料消耗，分别为２８．９３％、３１．６４％及１８．１３％、１９．３３％，效果明显，经济效益显著。投入产出比达７．４３－１３．１４１。从而说明以秸秆饲喂肉牛，加喂添加剂是提高饲料利用率，增加体重的重要途径更多还原

【Abstract】 With L 4(2 3) orthogonal methods,the single effect and compound effects of three feed additives,macrominerals,microminerals and growth promoting substance,on F 1 bull cvlres (Limousin×Local yellow cattle),under the condition of feeding wheat straw as main coase fodder were studied.Through 60 day experiment,it was showed that adding microminerals could get liveweight increased by 23.89%,and reduce food consumption by 16.18%,while adding growth promoting substance was 21.28% and 14.82% respectively,difference was significant compared with the control(P<0.05).However,adding macrominerals had a little effect,but not obvious.The compound of macrominerals and growth promoting substance could get liveweight increased by 51.99% (P<0.01),feed conversion rate by 28.33% compared with that of control.The premix feed made from growth promoting substance plus macrominerals,and microminerals plus macrominerals could get liveweight increased by 28.93% and 31.64% respectively,and feed conversion rate by 18.13% and 19.33% respectively.The ratio of input and output reached 7.43-13.14∶1.It was concluded that adding suitable additives was the important and economical way to increase liveweight and save feed of wheat straw feeding beef cattle.更多还原