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Dynamic change of relative weight of immune organs. (A) Spleen relative weight change. (B) Thymus relative weight change. (C) Bursa relative weight change. The chicks were weighed on weeks 1, 3, 5, 8, 11, 15, and 21 (n = 5/group). Data shown are the means ± SD. (*P < 0.05, statistically significant; **P < 0.01 very significant).
