The objective of this study was to examine the effects of dietary carbohydrases(xylanase and b-glucanase; XG), individually or in combination with phytase or acidifier on the growth performance, carcass attributes, in...The objective of this study was to examine the effects of dietary carbohydrases(xylanase and b-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.展开更多
文摘The objective of this study was to examine the effects of dietary carbohydrases(xylanase and b-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.
