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Effects of dietary choline level (mg/kg diet) on skin rot morbidity of juvenile grass carp (Ctenopharyngodon idella) after infection with A. hydrophila. (A) 142.2 mg/kg diet. (B) 1589.3 mg/kg diet. Values are means, and standard error of the mean represented by vertical bars. N = 6*5 for each choline level. Values having different letters are significantly different (P < 0.05). (C) Skin hemorrhage and lesion morbidity (%). (D) Choline requirement is assessed by morbidity.
