Greater antigenic exposure might accelerate activation and maturation of the humoral\nimmune system. After hatch, commercial broiler chickens can have early (EN) or delayed (DN)\naccess to nutrition, up to 72 h after hatch. The immune system of EN versus DN broilers is likely\nmore exposed to antigens after hatch. This might contribute to activation and maturation of the\nimmune system, but might also influence the development of oral tolerance, thereby altering later\nlife antibody responses. We studied antibody (IgM, IgY, IgA) responses between 21 and 42 d of age\nin fast-growing EN and DN broilers, kept under low (LSC) or high sanitary conditions (HSC). ...............
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