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The area occupied by the antigen-positive cells (mean ± SD, n = 8) in the cecal tonsil and spleen of 7-day-old, 21-day-old, and 42-day-old Green-legged Partridgelike chickens. CON: control, PRO: probiotics (L. lactis subps. cremoris), PRE: prebiotics (galactooligosaccharides [GOS]), SYN: synbiotics (GOS + L. lactis subsp. cremoris). Significant difference compared with the control (∗P < 0.05; ∗∗P < 0.01). Abbreviations: d7, day 7; d21, day 21; d42, day 42.
