棉粕替代豆粕对湖羊生长性能、表观消化率及屠宰性能的影响

The effect of replacing soybean meal with cotton meal on the growth performance,apparent digestibility,and slaughter performance of Hu sheep

文章旨在研究棉粕替代豆粕对湖羊生长性能、表观消化率及屠宰性能的影响。试验将100头初重(38.94±2.07)kg的育肥湖羊随机分为5组,每组4个重复,每个重复5头。对照组根据湖羊营养需求配制基础日粮,其余4组分别用25%、50%、75%、100%的棉粕替代基础日粮中的豆粕,各组湖羊均采用相同饲养管理措施,试验期为60 d。结果:(1)与对照组相比,棉粕替代水平为50%~100%时,湖羊末重、平均日增重显著降低(P<0.05),料重比显著上升(P<0.05)。(2)与对照组相比,棉粕替代水平为70%~100%时,湖羊干物质、粗蛋白质、中性洗涤纤维表观消化率显著降低(P<0.05)。(3)与对照组相比,棉粕替代水平为50%~75%时,湖羊宰前活重、胴体重显著降低(P<0.05)。棉粕替代水平为100%时,湖羊宰前活重、胴体重、净肉重显著降低(P<0.05)。结论:随着棉粕替代水平的提高,湖羊的生长性能、表观消化率及屠宰性能逐渐下降。其中,棉粕替代水平为25%时,湖羊生长性能、屠宰性能无负面影响;棉粕替代水平超过50%时,湖羊生长性能、表观消化率和屠宰性能均受到负面影响。

This experiment aims to investigate the effects of replacing soybean meal with cotton meal on the growth performance,apparent digestibility,and slaughter performance of Hu sheep.100 fattening Hu sheep with an initial weight of(38.94±2.07)kg were selected and randomly divided into 5 groups,each with 4 replicates and 5 sheep per replicate.The control group was allocated a basic diet based on the nutritional needs of Hu sheep,while the other four groups were replaced with soybean meal in the basic diet with 25%,50%,75%,and 100%cotton meal,respectively.The same feeding and management measures were adopted for each group of Hu sheep,and the experiment lasted for 60 days.Result:(1)Compared with the control group,when the substitution level of cotton meal was between 50%and 100%,the final weight and average daily weight gain of Hu sheep significantly decreased(P<0.05),and the feed to weight ratio significantly increased(P<0.05).(2)Compared with the control group,when the substitution level of cotton meal was between 70%and 100%,the apparent digestibility of dry matter,crude protein,and neutral detergent fiber in Hu sheep was significantly reduced(P<0.05).(3)Compared with the control group,when the substitution level of cotton meal was 50%~75%,the live weight and carcass weight of Hu sheep before slaughter were significantly reduced(P<0.05).When the substitution level of cotton meal was 100%,the pre slaughter live weight,carcass weight,and net meat weight of Hu sheep were significantly reduced(P<0.05).Conclusion:With the improvement of cotton meal substitution level,the growth performance,apparent digestibility,and slaughter performance of Hu sheep gradually decrease.When the substitution level of cotton meal is 25%,there is no negative impact on the growth performance and slaughter performance of Hu sheep;When the substitution level of cotton meal exceeds 50%,the the growth performance,apparent digestibility and slaughter performance of Hu sheep is negatively affected.