Influence of dietary carbohydrases, individually or in combination with phytase or an acidifier, on performance, gut morphology and microbial population in broiler chickens fed a wheat-based diet

摘要

The objective of this study was to examine the effects of dietary carbohydrases (xylanase and β-glucanase; XG), individually or in combination with phytase or acidifier on the growth performance, carcass attributes, intestinal microbial counts and morphology in broiler chickens fed a wheat-based diet. A total of 240 one-day-old male broiler chicks were randomly allocated into 4 treatment groups with 6 replicates of 10 birds each. The dietary treatments included a basal diet, the basal diet with an enzyme complex containing XG, XG plus a microbial phytase (XG?+?P) and XG plus acidifier (XG?+?A). The results indicated that feed conversion ratio (FCR) was improved in broiler chickens which received XG?+?A during the entire production period (1 to 35?d) of the trial ( P ??0.05). The broiler chickens fed XG?+?P had lower feed intake compared with the control group at 29 to 35?d of age. The experimental treatments had no effect on the body weight gain of broiler chickens. In carcass traits, except for spleen ( P ??0.05), the dietary treatments had no effects on the carcass characteristics of broiler chickens. The birds which received diets supplemented with XG and XG?+?A had a lower weight of the spleen compare with the control. Addition of XG in combination with phytase (XG?+?P) resulted in a decrease in ileal enumeration of Escherichia coli at 35?d of age ( P ? ?0.05). However, dietary treatments did not alter the population of ileal Lactobacilli in broiler chickens. Supplementing carbohydrases with phytase and acidifier (XG?+?P and XG?+?A) significantly increased the intestinal villus length at 35?d of age ( P ??0.05). In conclusion, the present study demonstrated that supplementation of the wheat-based diet with a combination with carbohydrases and acidifier (XG?+?A) improves FCR in broiler chickens. Furthermore, combinations of carbohydrases with phytase (XG?+?P) and with acidifier (XG?+?A) decrease the E.?coli counts and increase the villus length in broiler chickens.