Effects of Gallnut Tannin Acid on Growth Performance and Intestinal Health of Largemouth Bass
This study aimed to investigate the effects of gallnut tannin acid on growth performance and intesti-nal health of largemouth bass(Micropterus salmoides).A total of 450 largemouth bass with body weight of(10.23±0.05)g were randomly divided into 5 groups with 3 replicates in each group and 30 fish in each repli-cate.Fish in 5 groups were fed basal diets supplemented with 0(F0 group,as control group),0.05％(Fl group),0.10％(F2 group),0.15％(F3 group)and 0.20％(F4 group)gallnut tannin acid,respectively,and the breeding experiment lasted for 90 days.The results showed as follows:1)compared with F0 group,the weight gain rate(WGR)and specific growth rate(SGR)of F2 and F3 groups were significantly increased(P＜0.05),and the feed coefficient(FCR)was significantly decreased(P＜0.05).There were no significant differences in hepatopancreas somatic index(HSI),feeding rate(FR)and survival rate(SR)among all groups(P＞0.05).2)There were no significant differences in contents of crude fat,crude protein,crude ash and moisture in whole fish among all groups(P＞0.05);3)There were no significant differences in serum acid phosphatase(ACP),alkaline phosphatase(AKP),superoxide dismutase(SOD)activities and malondi-aldehyde(MDA)content among all groups(P＞0.05).4)There were no significant differences in activities of amylase,lipase and trypsin in intestine among all groups(P＞0.05).5)Compared with F0 group,the in-testinal villi of the other groups were increased and closely arranged;in the foregut tissue,the crypt depth of Fl and F2 groups was significantly lower than that of F0 group(P＜0.05).6)Compared with F0 group,the intestinal Proteobacteria relative abundance of the other groups was decreased,the intestinal flora homeostatic index was increased,and the intestinal flora homeostatic index of F3 group was significantly higher than that of F0 group(P＜0.05).In summary,dietary gallnut tannin acid can improve the growth performance,improve intestinal tissue structure,optimize intestinal flora and protect intestinal health of largemouth bass;using specif-ic growth rate as the evaluation index,the dietary suitable addition amount of gallnut tannin acid for largemouth bass is 0.10％to 0.15％.[Chinese Journal of Animal Nutrition,2024,36(1):451-463]
gallnut tannin acidlargemouth bassgrowth performanceintestinal health
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维普
