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Effects of dietary Bacillus subtilis on growth performance and serum immunoglobulin of chickens. (A) The body weights were measured at 3, 7, 14, and 21 days after feeding B. subtilis. The concentrations of IgA (B), IgG (C), and IgM (D) were measured at 7, 14, and 21 days after feeding B. subtilis. Bars were expressed as means ± standard deviations (n = 5). *P < 0.05.
