β-羟基β-甲基丁酸钙对肉仔鸡生长性能、屠宰性能和血液激素的影响

Effects of Βeta-Hydroxy-Βeta-Methyl-Butyrate Calcium on Growth Performance, Slaughter Trait and Serum Hormones in Broiler Chickens

试验旨在探讨日粮中β-羟基β-甲基丁酸钙(HMB-Ca)对肉仔鸡生长性能、屠宰性能和血液激素变化的影响。选用刚出雏的雄性肉雏鸡600只,随机分配到5个处理组(每组6个重复,每重复20只鸡),分别饲喂HMB-Ca添加量为0(对照组)、0.05%、0.1%、0.15%和0.2%的日粮,试验期42d。测定1～21、22～42、1～42d的平均日增重、平均采食量和料重比,42d的屠宰性能及21、42d血清激素含量。结果表明,各组间肉鸡的平均日增重、平均日采食量和料重比均无显著差异(P>0.05),但后期和全期均以0.1%HMB-Ca组为最佳;42d时,0.1%HMB-Ca显著提高肉鸡胸肌率(P<0.05),同时该处理也有提高腿肌率的趋势(P>0.05);42d时,0.05%以上HMB-Ca组胰岛素含量均显著高于对照组(P<0.05),以0.1%添加水平为最高;低剂量HMB-Ca(0.05%)组生长激素水平显著高于高剂量HMB-Ca组(0.15%和0.2%)(P<0.05)。综上可知,HMB-Ca可促进肉仔鸡胸肌的生长发育,提高血清中胰岛素含量;肉仔鸡日粮中适宜的HMB-Ca添加水平为0.1%。

The purpose of this experiment was to investigate the effects of dietary beta-hydroxy-beta-methyl-butyrate calcium（HMB-Ca） on growth performance,slaughter trait and blood hormones in broiler chickens.Six hundred day-old Arbor Acres（AA） chickens were randomly divided into five groups with six replicates of twenty chickens and fed different levels of HMB-Ca（0（control group）,0.05%,0.1%,0.15% and 0.2%） in the diet respectively.The experiment lasted 42 d.Growth performance including average daily weight gain（ADG）,average daily feed intake（ADFI）,feed to gain ratio（F/G） during 1 to 21 d,22 to 42 d,1 to 42 d,slaughter trait at 42 d and serum hormones at the age of 21,42 d were determined.The results showed that,compared with the control,there were no significant differences on ADG,ADFI and F/G by adding different levels of HMB-Ca during the experiment（P0.05）,and dietary 0.1% HMB-Ca ameliorated the F/G in 22 to 42 d and 1 to 42 d;chicks fed 0.1% HMB-Ca diet had significant increased breast muscle rate（P0.05）,and also had the trend of increasing leg muscle rate;At 42 d of age,chicks in the groups of HMB-Ca adding level above 0.05% had significant higher serum insulin level compared to the controls（P0.05）,and those in 0.1% HMB-Ca group was the highest.Serum GH level was higher in lower（0.05%） HMB-Ca level group than those in higher（0.15%,0.2%） HMB-Ca levels（P0.05）.In conclusion,appropriate dietary HMB-Ca could enhance the breast muscle rate and serum insulin level,and it seemed that the 0.1% inclusion level was recommended in production.