Effects of different protein levels of diets on growth performance and meat quality of barn feeding small tailed Han sheep male lambs
The experiment was to study the effects of different protein levels in the diet on the growth performance and meat quality of penned small tailed Han sheep lambs.A total of 75 male lambs of the small tailed Han sheep,approximately 90 days old,were randomly divided into three experimental groups:Group Ⅰ(low protein group,12.16％),Group Ⅱ(medium protein group,14.04％),and Group Ⅲ(high protein group,15.70％),with five replicates per group and five male lambs per replicate.The preliminary trial lasted for 10 days,and the formal experiment lasted for 90 days.The results showed that the average weight gain and average daily weight gain of Group Ⅱ and Group m were extremely higher than those of Group Ⅰ(P＜0.01),and the feed to gain ratio was significantly lower than that of Group Ⅰ(P＜0.05).The carcass weight and backfat thickness of Group Ⅰ were significantly lower than those of Group Ⅱ and Group m(P＜0.05),while the cooking loss,drip loss,brightness value,and yellowness value were significantly higher than those of Group Ⅱ and Group Ⅲ(P＜0.05).The average daily income of the lambs in Group Ⅱ was 2.47 yuan/d,which was 0.74 yuan/d higher than that of Group Ⅰ and 0.39 yuan/d higher than that of Group Ⅲ.The study indicates that when the metabolizable energy level is between 11.52 and 11.57 MJ/kg,increasing the dietary protein level can improve the growth performance of barn feeding small tailed Han sheep and has a positive effect on the meat quality,with the highest economic benefit achieved at a crude protein level of 14.04％.
proteinsmall tailed Han sheepgrowth performancemeat qualityeconomic benefits
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