【摘要】 试验采用Ｌ４（２３）型正交法，对利本杂一代周岁小公牛进行两个月试验。比较了促生长剂、微量元素和维生素以及不同青贮玉米秸比例３种因素的影响效果。每组３头牛，每个处理６头牛。通过试验看出，日粮中利用６０．００％的青贮玉米秸，添加由促生长剂和微量元素等组成的添加剂预混料喂肉牛可以获得８９２ｇ日增重，较不用添加剂者增加１１０ｇ，即提高１４．０７％，每ｋｇ增重节约饲料０．８ｋｇ（８．４８％）；饲料中添加促生长剂较不添加者，可提高日增重１１．２３％，减少饲料消耗８．７６％（单位增重）；降低饲料中秸秆比例，青贮玉来米秸由６０．００％减少到４０．００％（风干重），日增重提高３１．７２％达１０８８ｇ，每ｋｇ增重消耗饲料７．１１ｋｇ（干物质６．４ｋｇ），节约饲料１．９９ｋｇ，提高饲料报酬２１．８７％，总体经济效益相似。但是每ｋｇ增重多耗精料０．５７ｋｇ，每ｋｇ增重饲料费用并未降低；本试验中饲料添加微量元素可提高日增重４．７５％，较其他因素差些。更多还原

【Abstract】 With L 4(2 3)orthonal design the F 1 yearling bulls (Limousin × Local breed)were tested for two months to compare the effects of three factors ;growth promoting substance,trace elements and vitamin ,different ratio of corn stalk silage (with 3 bulls each group and 6 on each treament ).The results showed that cattle fed with 60% corn stalk silage in diet and premix fed with growth promoting substance and trace element could be increased 892g daily gain ,which was 110g more than that of no using (increased by 14.07%).Liveweight gain per kg saved 0.8kg feed (8.48%).Adding growth promoting substance in feed could increase 11.23% of daily gain than that of no adding ,and unit gain weight reduced food consumption 8.76%.Reducing stalk ratio in feed,corn stalk silage decreased from 60%to 40.0%(air dry weight )could increase 31.72% daily gain to 1 088g and got food consumption of per kg gain weight 7.11kg(dry matter 6.4kg),saved feed 1.99kg and increased feed conversion by 2.187%.The total economic benefit was similar,but this consumed 0.57%kg more concentrates per kg gain weight and feed cost per kg gain weight was not decreased .Adding feed trace element could increase daily gain by 4.75%,but were not so good as the other factors.更多还原