益生素、甜叶菊提取物对鸡生长、屠宰、免疫性能及血清尿素氮的影响

Effects of Probiotics and Stevia Extract on Growth,Slaughter,Immunity Performance and Serum Urea Nitrogen in Chickens

试验旨在探讨饲料中添加益生素、甜叶菊提取物对青脚麻鸡生长性能、屠宰性能、免疫性能及血清尿素氮含量的影响。将160只青脚麻鸡随机分为四组,每组4个重复,每个重复10只。A组日粮添加0.2%益生素;B组日粮添加0.2%甜叶菊提取物和0.2%益生素;C组日粮添加0.2%甜叶菊提取物;D组为空白对照组饲喂基础日粮。饲养试验时间为8周。结果表明:与空白对照组(D组)相比,在生长性能方面,A、B组的体重在第6周和第8周时显著增加(P<0.05);在屠宰性能方面,A、B组青脚麻鸡的宰前活重、屠宰率、全净膛率和半净膛率均显著增加(P<0.05);在免疫器官指数方面,B组青脚麻鸡的法氏囊指数显著增加(P<0.05);在血清尿素氮含量方面,A、B、C三组青脚麻鸡血清尿素氮的含量显著降低(P<0.05)。综上所述,饲料中添加益生素可以改善青脚麻鸡的生长性能和屠宰性能,并降低其体内血清尿素氮的含量,当与甜叶菊提取物一起添加时,还可提高其法氏囊指数。

This experiment was conducted to explore the effects of probiotics and stevia extract on the performance of growth and slaughter,immunity and serum urea nitrogen for Green Legged Partridge.The 160 Green Legged Partridge were randomly divided into four groups.There were four replicates in each group,each replicate with 10 chickens.The ration chicken of group A was supplemented with 0.2%pro⁃biotics,and the one in the group B was added with 0.2%probiotics and 0.2%stevia extract,and the one in the group C was appended with 0.2%stevia extract.Group D fed the basic diet as the blank control(group D).Feeding time lasted eight weeks.In the aspect of growth performance,the body weight of groups A and B significantly increased at sixth and eighth week(P<0.05)compared with blank control group(group D).In terms of slaughter performance,live weight,slaughter rate,full eviscerated rate and half eviscerated rate in group A and B were significantly more increased than the blank control group(P<0.05).In the index of immune organs,the bursal index of group B compare with blank control has signifi⁃cantly improved(P<0.05).On the contrary,the level of serum urea nitrogen in group A,B and C were significantly lower than that in the blank con⁃trol group.In conclusion,adding probiotics in di⁃ets could improve the Green Legged Partridges'growth and slaughter performance,decrease the level of serum urea nitrogen.When probiotics and stevia extract were added at the same time, the chicken's bursal index could also be increased.