稻谷型饲粮中添加复合酶制剂对肉鸡生长性能、肠道健康和养分表观代谢率的影响OA

This study aimed to investigate the effects of supplementing compound enzymes preparation in rice-based diets on the growth performance,intestinal health,and nutrient apparent metabolic rate of broilers.A total of 480 aged one day healthy male Meihuang No.1 broilers with similar body weights were randomly divided into three groups,with eight replicates per group and 20 broilers per replicate.The control group(group CON)was fed a basal diet,while the experimental groups received the basal diet supplemented with compound enzymes preparation at 150 g/t(group CEP150)and 200 g/t(group CEP200),respectively.The test period lasted for 70 days and was divided into the early phase(1 to 35 days)and the late phase(36 to 70 days).The results showed that compared with group CON,the average daily gain(ADG)in group CEP200 during the early phase was significantly increased(P<0.05),and the feed-to-gain ratio(F/G)was significantly reduced(P<0.05).The ADG in groups CEP150 and CEP200 was significantly increased during the late phase and the overall period(P<0.05).There was no significant difference in the average daily feed intake(ADFI)among the groups(P>0.05).The drip loss of breast muscle in group CEP200 was significantly lower than that in groups CON and CEP150(P<0.05),while no significant differences were observed among groups in pH24 h value,meat color,and shear force of breast muscle(P>0.05).Compared with the group CON,the villus height(VH)and villus height to crypt depth ratio(VH/CD)of the duodenum,jejunum,and ileum in groups CEP150 and CEP200 were significantly increased(P<0.05).The levels of interleukin-1β(IL-1β)and tumor necrosis factor-α(TNF-α)of duodenal mucosa were significantly decreased(P<0.05),and the levels of interleukin-6(IL-6)and TNF-α in jejunal and ileal mucosa were significantly reduced(P<0.05).There were no significant differences in the activities of α-amylase,lipase,trypsin,and chymotrypsin of intestine in groups CEP150 and CEP200(P>0.05),the apparent metabolic rates of dry matter,crude protein,crude ash,calcium,and phosphorus were significantly increased(P<0.05).The study shows that supplementing compound enzymes preparation in rice-based diets can improve intestinal health,enhance small intestinal absorption function,and consequently improve the growth performance of broilers,with the optimal effect observed at the supplementation level of 200 g/t.