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为了研究复合小肽制剂对肉鸡生长后期环境和健康的影响,试验选择32日龄健康AA+肉鸡800只,随机分为4组,每组设4个重复,每个重复50只鸡,各组肉鸡饲养在不同的鸡舍中。对照组饲喂不含复合小肽制剂的基础日粮,试验1组、试验2组、试验3组分别在基础日粮中添加1.0%、1.5%和2.0%的复合小肽制剂,试验期10 d。结果表明:添加1.0%的复合小肽制剂第10天肉鸡舍内的NH_3含量显著下降(P<0.05),肉鸡的胸腺指数、腔上囊指数显著升高(P<0.05),6~10 d肉鸡呼吸道病的发病率和整个试验期的大肠杆菌病发病率及死亡率显著降低(P<0.05);添加1.5%、2.0%的复合小肽制剂能显著或极显著降低第5天和第10天肉鸡舍内的NH_3含量(P<0.05或P<0.01),显著提高肉鸡的胸腺指数、腔上囊指数、脾脏指数和新城疫抗体效价(P<0.05),肉鸡的呼吸道病发病率、大肠杆菌病发病率和死亡率显著或者极显著降低(P<0.05或P<0.01)。说明在肉鸡日粮中添加1.5%~2.0%的复合小肽制剂能明显降低肉鸡舍的NH_3含量,有利于肉鸡免疫器官的发育和提高新城疫抗体效价,降低肉鸡的发病死亡率。
In order to study the effect of compound small peptide preparation on environment and health of broilers, 800 healthy AA + broilers aged 32 days were randomly divided into 4 groups with 4 replicates in each group and 50 chickens in each group. Feeding in different sheds. The control group was fed the basal diet without compound small peptide preparation. The first, second and third groups were supplemented with 1.0%, 1.5% and 2.0% d. The results showed that the content of NH_3 in the broiler house on day 10 was significantly decreased (P <0.05), and the thymus index and supraselmenial index of broiler chickens were significantly increased (P <0.05) (P <0.05). The addition of 1.5% and 2.0% of compound small peptide preparations significantly or extremely significantly reduced the incidence of respiratory tract disease and the incidence of colibacillosis in the whole experimental period (P <0.05) The NH3 content (P <0.05 or P <0.01) in 10-day broiler chickens significantly increased thymus index, supracavitary index, spleen index and Newcastle disease antibody titer (P <0.05) The rates of morbidity and mortality of colibacillosis were significantly or extremely significantly reduced (P <0.05 or P <0.01). The results showed that adding 1.5% ~ 2.0% of compound small peptides in broiler diets could significantly reduce the NH_3 content in broiler house, promote the development of immune organs and increase the antibody titer of Newcastle disease, and reduce the morbidity and mortality of broiler chickens.