【摘要】 选用５～７月龄西黄杂一代公牛１８头，按营养水平不同随机分成试验Ⅰ、Ⅱ、Ⅲ三组，进行了为期６０天的试验。试验结果表明：在以粗料为主的日粮类型中，高营养水平组（试验Ⅲ）增重最快，日增重分别比中（试验Ⅱ）、低（试验Ⅰ）营养水平组提高了１８．１５％（Ｐ＜０．０５）和９０．２１％（Ｐ＜０．０１），差异明显；单位增重饲料成本，以中营养水平组最低，分别比高、低营养水平组降低了１４．９９％和２．３１％。经综合评定以中营养水平组试验效果最好，其经济效益分别比高、低营养水平组提高３０．６７％和６８．７６％，差异显著（Ｐ＜０．０５）。更多还原

【Abstract】 Bulls(18 cattle) of 5 to 7 month old(Xi Huang First generation)are classified in group I(low nutritional level)、group Ⅱ(medium nutritional level)and group Ⅲ (high nutritional level)randomly.With the coarse fodder,the bulls in group Ⅲ get the fastest increase in weight,the daily weight increase of group Ⅲ was 18.15%( P <0.05)and 90.21%( P <0.01) higher than that in group Ⅱ and group Ⅰ,respectively,the difference is manifest;group Ⅱ has the lowest ratio of fodder and weight increase,which is 14.99% and 2.31% lower than tnat in group Ⅲ and group Ⅰ;evaluating the situation,group Ⅱ has the best economic effect,which is 30.67% and 68.76% higher than that in group Ⅲ and group Ⅰ respectively,the obvious result is found.更多还原