To explore the effects of alfalfa powder on the growth performance,intestinal antioxidant indicators,and intestinal morphology of piglets.320 piglets with similar age(28±2)and good health were divided into 4 groups,with 8 replicates in each group,and 10 piglets were fed with 0%,3%,6%,and 9%alfalfa meal instead of bran for each experimental group.The experiment lasted for 76 days in total,including 6 days of adaptation period and 70 days of formal experiment.The results show that the addition of 6%and 9%alfalfa meal to the diet significantly increased the final body weight of piglets by 3.2%and 3.5%(P＜0.05);The average daily weight gain of piglets in the group with 6%and 9%alfalfa meal added to the diet significantly increased by 3.6%and 4.3%(P＜0.05);The feed to weight ratio of piglets significantly decreased by 6.1%(P＜0.05)in the group with 9%alfalfa meal added to the diet;In addition,alfalfa meal had no significant effect on the feed intake of piglets(P＞0.05).The GSH-Px enzyme activity in the duodenum of piglets in the 6%and 9%alfalfa meal groups was significantly higher than that in other groups(P＜0.05).Adding alfalfa meal to the diet significantly improved the T-AOC ability of piglets in the jejunum(P＜0.05)and significantly reduced the MDA content in the jejunum(P＜0.05);The supplementation of 6%and 9%alfalfa meal groups significantly increased the activity of GSH-Px and SOD in the ileum of piglets,and increased the T-AOC ability(P＜0.05).In addition,the addition of alfalfa meal to the diet had no significant effect on the activity of SOD,CAT and T-AOC in the duodenum of piglets,GSH-Px,SOD and CAT in the jejunum,and CAT activity in the ileum(P＞0.05).The duodenal V/C values of piglets in the 6%and 9%alfalfa meal groups were significantly higher than those in other groups(P＜0.05);The villus height and V/C value of the piglets in the 6%and 9%alfalfa meal groups were significantly higher than those in the other groups(P＜0.05);The ileal villus height and V/C value of piglets in the group with 6%alfalfa meal added to the diet were significantly higher than those in the other groups(P＜0.05);In addition,adding alfalfa meal to the diet had no significant effect on the height and depth of duodenal villi,jejunal crypt,and ileal crypt in piglets(P＞0.05).In summary,adding alfalfa powder can effectively enhance the intestinal antioxidant properties of piglets,improve their intestinal structure and promote growth.Under the conditions of this experiment,the optimal substitution amount for alfalfa powder is 6%.
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