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Serum anti-bovine serum albumin (BSA) antibody analysis after hatching: (A) the bound anti-BSA IgY antibodies; (B) the bound anti-BSA IgM antibodies; (C) the bound anti-BSA IgA antibodies. x-axis means chick age of days. y-axis means the OD value at 465 nm. The error bars indicate the SEM. * p ≤ 0.05; ** p ≤ 0.01.
