Effects of different protein raw materials on growth performance,slaughter performance,nutrient apparent digestibility,and immune indicators of mutton sheep
HUANG Zengli
LI Yonge
DAI Yiguo
LIU Guanghui
ZHANG Wei
Abstract：The trial was aimed to investigating the effects of different protein raw materials added to the diet on the growth performance,slaughter performance,nutrient apparent digestibility,and immune index of mutton sheep.A total of 150'Dorper×Mongolian'hybrid mutton sheep were randomly divided into five groups,with six replicates per group and five sheep per replicate.The control group was fed a basal diet containing 15%soybean meal.The cottonseed meal group,peanut meal group and rapeseed meal group were fed with cottonseed meal,peanut meal and rapeseed meal instead of soybean meal,respectively.The mixed meal group was fed a diet composed of cottonseed meal,peanut meal,and rapeseed meal in a 1∶1∶1 ratio.The pre-trial period lasted 10 days,and the formal trial period lasted 120 days.The results showed that compared with the control group,the final body weight,average daily feed intake,and average daily gain of the sheep in the cottonseed meal group were significantly reduced(P＜0.05),while the final body weight of the sheep in the mixed meal group was significantly increased(P＜0.05),and the feed-to-gain ratio was significantly decreased(P＜0.05).The live weight before slaughter,carcass weight,and slaughter rate of the sheep in the cottonseed meal group were significantly lower than those of the other groups(P＜0.05),while those of the sheep in the mixed meal group were significantly higher than those of the other groups(P＜0.05).The nutrient apparent digestibility of crude protein in the cottonseed meal group,peanut meal group,and rapeseed meal group was significantly decreased(P＜0.05),while there were no significant differences in nutrient apparent digestibility between the mixed meal group and the control group(P＞0.05).There were no significant differences in immune index among the groups(P＞0.05).The study indicates that replacing soybean meal with a mixed meal as a protein source in the diet for mutton sheep is effective and feasible,and it is worth promoting and applying in the mutton sheep industry.
Keywords：protein raw materialsmutton sheepgrowth performancenutrient apparent digestibilityimmune index
Publication Date：2025-01-29
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 27-31 )