复合除臭剂对肉鸡生长性能、免疫器官指数、消化道pH、盲肠挥发性脂肪酸和盲肠菌群的影响

试验旨在通过在基础日粮中添加不同水平的复合除臭剂，研究其对肉鸡生长性能、免疫器官指数、消化道pH、盲肠挥发性脂肪酸和盲肠菌群的影响。选用1日龄健康爱拔益加肉雏鸡900只，随机分成5组，每组6个重复，每个重复30只鸡。Ⅰ组为对照组仅饲喂基础日粮，Ⅱ、Ⅲ、Ⅳ和Ⅴ组为试验组，分别在基础日粮中添加0.5‰、1‰、2‰和3‰的复合除臭剂，预试期14 d，试验期28 d。结果显示，Ⅴ组免疫器官指数最高，28日龄的脾脏指数和法氏囊指数分别比对照组提高37.74%、18.40%。Ⅱ组肠道pH降低效果最明显，回肠和盲肠部位pH分别比对照组降低1.04、0.79（P<0.05）。Ⅲ组28日龄的乙酸、丁酸、丙酸含量分别比对照组降低41.74%、35.96%、30.56%（P<0.05）；Ⅴ组42日龄的乙酸、丁酸含量分别降低38.04%、44.52%（P<0.05）。各试验组盲肠乳酸杆菌数量均高于对照组，大肠杆菌数量均低于对照组。综上所述，日粮中添加复合型除臭剂，能明显降低盲肠挥发性脂肪酸的产生，改善消化道内环境，同时对免疫器官指数的提高有一定的促进作用，对生长性能无显著影响。综合考虑，该复合除臭剂在肉鸡基础日粮中的适宜添加比例为1‰。

Effects of Composite Deodorant on Growth Performance,Immune Organ Index,Digestive Tract pH,Volatile Fatty Acid and Microflora in Cecum of Broilers

The experiment was conducted to study the effects of composite deodorant with different supplemental levels on growth performance,immune organ index,intestinal tract pH value,contents of volatile fatty acid and microflora in cecum of broilers. A total of 900 14-day-old healthy AA broilers were randomly assigned to 5 groups (groups Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴ) with 6 replicates per group and 30 broilers per replicate. The experimental treatments were divided as follows:The broilers in group Ⅰ(control group) were only fed basal diet.0.5‰,1.0‰,2.0‰,3.0‰ composite deodorant were added in groups Ⅱ,Ⅲ,Ⅳ and Ⅴ,respectively. The experiment lasted for 28 days. The results showed as follows:The index of immune organ in group Ⅴ were the highest. The index of spleen and bursa increased by 37.74%,18.40% than that of control group on 28 days,respectively. The change of intestinal tract pH in group Ⅱ were the largest. pH value of ileum and cecum were significantly lower by 1.04,0.79 than that of control group (P<0.05),respectively. Compared with the control group,the contents of acetic acid,butyric acid and propionic acid in group Ⅲ were significantly reduced by 41.74%,35.96%,30.56% on 28 days old (P<0.05),respectively. The contents of acetic acid and butyric acid in group Ⅴ were significantly reduced by 38.04% and 44.52% on 42 days old (P<0.05),respectively. The numbers of Lactobacillus from cecum in treatment groups were more than that of control group,while the numbers of E.coli were less than that of control group. In conclusion,treatment groups could reduce the contents of volatile fatty acids obviously,improve the environment of digestive tract,enhance the immune organ index and there was no significant negative effect in improving growth performance. Considering all of the results,it was calculated that the broilers diet with 1‰ composite deodorant was the most appropriate.