谷草对肉羊生长性能、屠宰性能和经济效益的影响

Effect of millet straws on growth performance, slaughter performance and economic benefit of mutton sheep

为了了解日粮中添加不同比例的谷草对肉羊生长性能、屠宰性能和经济效益的影响,试验采用单因素试验设计,选择健康、体重相近的6月龄杂交一代公羊75只,随机分为对照组、试验1组、试验2组、试验3组和试验4组,每组5个重复,每个重复3只羊,试验预试期15 d,正试期45 d。对照组饲喂粗饲料为玉米秸秆和苜蓿的基础日粮,试验1组、2组、3组和4组分别用5%、10%、15%和20%的谷草替代日粮中的粗饲料,测定试验羊的生长性能指标、屠宰指标和经济效益指标,分析日粮中添加不同水平谷草的育肥效果。结果表明:试验期各试验组育肥羊的日增重、净肉重和总收入均高于对照组,而屠宰率各组间无显著差异(P>0.05),其中试验2组羊的日增重显著高于对照组(P<0.05),试验1组、2组、3组的净肉重和胴体净肉率均显著高于对照组(P<0.05),试验2组总收入和总盈利最高。说明在育肥羊日粮中添加谷草可以提高羊的日增重、净肉重和经济效益,适宜的添加量为10%。

In order to investigate the effects of millet straws on growth performance, slaughter performance and economic benefit of mutton sheep, a single factor design was adopted in this experiment. Seventy-five healthy six-months-old healthy crossbred rams with average initial weight were randomly divided into control group, trial group 1, trial group 2, trial group 3 and trial group 4, with five replicates in each group and three sheep in each replicate. The feeding trial included 15 d of pre-test period and 45 d of formal period. Animals in the control group were fed a basal diet containing a roughage corn stalk-alfalfa mixture. Animals in experimental groups 1, 2, 3 and 4 were fed diets containing 5%, 10%, 15% and 20% millet straw instead of roughage, respectively. At the end of the experiment, the growth performance index, slaughtering index and total revenue of experimental sheep were determined, and then the fattening effect of adding different levels of grain grass to diet was analyzed. The results showed that the daily gain, net meat gain and total revenue of fattening sheep in experimental groups were higher than those of fattening sheep in control group, but there was no significant difference in slaughter rate among all groups(P>0.05). The average daily gain in trial group 2 was significantly higher than control group(P<0.05), the net meat gain and net meat rate in trial groups 1, 2 and 3 were significantly higher than that in control group(P<0.05), and the total revenue and earnings in trial group 2 was the highest. The results indicated that add millet straw in the diet could improve average daily gain, net meat gain and economic benefit of mutton sheep. The suitable addition amount millet straw was 10%.