丁酸甘油酯对肉鸡生长性能、养分表观消化率、屠宰性能、肠道形态及微生物菌群的影响

试验旨在研究丁酸甘油酯对肉鸡生长性能、养分表观消化率、屠宰性能、肠道形态及微生物菌群的影响。选用1日龄罗斯308肉鸡384羽，随机分为4组，每组4个重复，每个重复24羽。对照组饲喂基础日粮，试验组在基础日粮中添加250、500、750 g/t剂量的丁酸甘油酯替代40%的油脂饲喂，试验周期为42 d。结果显示，与空白对照组相比，饲料中添加丁酸甘油酯对于肉鸡的生长性能具有促进作用，其中中剂量组（500 g/t）添加效果最好。各剂量组肉鸡屠宰性能较空白对照组有所改善，但差异不显著（P>0.05）；与空白对照组相比，各剂量组十二指肠和空肠肠绒毛高度均有所提高，其中中剂量组与对照组差异显著（P<0.05），各剂量组隐窝深度有变浅的趋势，但差异不显著（P>0.05）；与空白对照组相比，中剂量组的粗脂肪和粗纤维表观消化率均显著提高（P<0.05）；大肠杆菌数量显著减少（P<0.05），盲肠乳酸菌数量显著增加（P<0.05）。综上所述，基础日粮添加丁酸甘油酯能促进生长性能，提高饲料养分消化率，改善肠道形态和微生物菌群，肉鸡日粮中丁酸甘油酯最佳添加剂量为500 g/t。

Effects of Butyrin on Growth Performance,Nutrient Apparent Digestibility,Slaughter Performance,Intestinal Morphology and Microbial Flora of Broilers

This experiment was conducted to investigate the effects of butyrin on the growth performance,nutrient apparent digestibility,slaughter performance,intestinal morphology and microbial flora of broilers.A total of 384 1-day-old Rose 308 broilers were selected and randomly divided into 4 groups,4 replicates per group and 24 broilers per replicate.The blank control group was fed on basal diet,the experimental groups were fed on basal diet supplemented with 250,500 and 750 g/t butyrin,respectively,which replaced 40% oil of the basal diet.The experiment lasted for 42 days.The result showed that compared with the blank control group,diets supplemented with butyrin had an promoting effect on the performance of broilers,and the middle dose group (500 g/t) was the best.The slaughter performance of supplemented groups showed a tendency to be improved,but there was no significant difference with blank control group (P>0.05);The height of duodenum and jejunum villus of middle supplemented group were significantly improved (P<0.05),and the crypt depth of supplemented groups tended to be reduced,but there was no significant difference (P>0.05);Compared with the blank control group,the apparent digestibility of crude fat and crude fiber of middle supplemented group were significantly improved (P<0.05);The amount of Escherichia coli of middle supplemented group was significantly decreased (P<0.05);And the amount of Lactobacillus was significantly improved (P<0.05).In conclusion,basal diet supplemented with butyrin could promote the growth performance,increase the nutrient digestibility,improve the intestinal morphology and microbial flora of broilers.The best supplemented level of butyrin for diets was 500 g/t.