Effects of probiotics on growth performance,digestive enzyme activity and intestinal health of broilers
In order to study the effects of probiotics on growth performance,digestive enzyme activity and intestinal health of broilers,300 broilers were randomly divided into 4 treatments.0%,0.1%,0.3%and 0.5%probiotic agents were added to the basal diet.The results showed that the addition of 0.1%probiotics had no significant effect on the growth performance of broilers,and the daily feed intake and daily gain of 0.3%probiotics treatment were not significantly different from those of the control group(P＞0.05).Compared with the control group,the feed-to-weight ratio decreased by 8.8%,and the daily feed intake of 0.5%probiotics treatment was not significantly different from that of the control group(P＞0.05),and the average daily gain was 10.4%higher than that of the control group(P＜0.05).The ratio of feed to weight was 9.9%lower than that of the control group(P＜0.05).0.1%probiotics had no significant effect on digestive enzyme activity in jejunum of broilers(P＞0.05).Trypsin,lipase and amylase activities treated with 0.3%probiotics increased significantly by 15%,44%and 47%respectively compared with the control group(P＜0.05).The activities of trypsin,lipase and amylase treated by probiotics were significantly increased by 32%,47%and 58%,respectively(P＜0.05).Addition of 0.1%probiotics significantly reduced intestinal inflammation in broilers,but had no significant effect on other intestinal health indexes(P＞0.05).Addition of 0.3%and 0.5%probiotics significantly increased villus height,villus-to-crypt ratio,SIgA content,intestinal barrier gene Occludin and ZO-1 expression in jejunum of broilers,but had no significant effect on crypt depth(P＞0.05).The addition of 0.5%had the best effect,resulting in a 42.5%increase in SIgA content compared with the control group,an increase of 114%and a 48%increase in the expression of Occludin and ZO-1.In summary,probiotics can significantly increase the intestinal digestive enzyme activity and improve the intestinal health status of broilers,thus improving the growth performance of broilers.
probioticsbroilersgrowth performancedigestive enzymesintestinal health
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