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Intestinal histology (20x) of T. ovatus fed experimental diets: (a) PC group, (b) HL group, (c) HS group, and (d) morphological parameters of intestine including villus number (VN), villus height (VH), and muscular layer thickness (MLT). Values are means ± SEM of three replications. Different letters above the bar indicate statistical differences (P < 0.05).
