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Morphology of the midintestine in rainbow trout after 30 days of feeding. (A) CK group; (B) Bacillus velezensis MVCR2 strain supplementation group; (C) Lactobacillus sakei rMA-2 strain supplementation group; (D) muscularis thickness; (E) villus height; (F) villus width. Data are given as the mean ± SD. Different letters above each bar indicate significant differences (P < 0.05).
