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Dynamic change of body weight and relative weight of immune organs. (A) 100% of the avian leukosis virus subgroup J (ALV-J) infected groups showed growth suppression. (B) Spleen showed strong immune response until 4-weeks-of-age. (C) Thymus relative weigh of infected groups showed a persistent decrease. (D) Relative weigh of bursa of Fabricius were significantly lower than the control group.
