尿素精料和碱化秸秆在幼羊全混合日粮中的应用效果

选用 １２ 只两月龄东北细毛公幼羊，按体重大小随机分为 ４ 组，测定不同加工处理全混合日粮（ＴＭ Ｒ）对其生产性能的影响，并分析ＴＭ Ｒ饲养的经济效益。试验结果表明，在含玉米秸的ＴＭＲ 中以尿素精料等氮代替豆饼，在不降低幼羊生产性能的前提下（Ｐ＞ ０．０５），使每千克增重的饲料费用降低２６．４４％ ；在含尿素精料的 ＴＭＲ 中，玉米秸的碱化处理虽未显著影响幼羊的日增重及日采食 ＴＭ Ｒ 量（Ｐ＞ ０．０５），但却使ＴＭＲ 转化率提高了 ２１．５２％ （Ｐ＜ ０．０１），而且每千克增重的饲料费用降低 １１．２５％ ；对含尿素精料及碱化玉米秸的ＴＭＲ 进行颗粒化加工，与加工前相比，试羊日增重、日采食 ＴＭＲ 量及其转化率分别提高了 １６１．９２％ （Ｐ＜ ０．０１）、８８．７４％ （Ｐ＜ ０．０１）及２８．０１％ （Ｐ＜ ０．０１），每千克增重的饲料费用降低１７．６４％ 。

Effect of Urea-concentrate and Alkali Treated Corn Stover Diets on the Performance of Lambs

Twelve lambs with age of 2 months were allotted randomly to four groups according to body weight and used to study the effect of four different total mixed rations on their performance. The results showed:①When soybean cake in diet with corn stover was replaced by urea concentrate on the basis of equal nitrogen, the performance of lambs was not affected(P>0.05),the feed cost per kilogram gain was reduced by 26.44%; ②Alkali-treatment on the corn stover in diet with the urea concentrate did not affect the average daily gain and diet intake adversely(P<0.05),but the diet efficiency was improved by 21.52%(P<0.01) and the feed cost per kilogram gain was decreased by 11.25%;③Pelleting of diet with the alkali-treated corn stover and the urea concentrate increased the average daily gain, diet intake and its efficiency by 161.92%(P<0.01),88.74%(P<0.01) and 28.01%(P<0.01) respectively and the feed cost per kilogram gain was reduced by 17.64%.