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Lymphocyte subpopulations in blood at 14, 21, 28, and 42 days of age. Percentage of (A) CD3+; (B) CD4+; (C) CD8+; (D) Bu-1+ lymphocytes in control (dark column) and XPC-supplemented (gray column) broilers (1.25 kg/ton; Diamond V Original XPC, Cedar Rapids, IA, USA). n = 5 per treatment per day. Data are presented as group means ± SEM. Different letters indicate significant differences (P < 0.05).
