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Main effects of dietary PUFA n-6:n-3 ratio (a), dietary vitamin E level (b), post-phytohemagglutinin (PHA)-injection time (c), and age of chickens (d) on the heterophil:lymphocyte ratio (H:L) in the blood. Each bar represents mean ± SEM; A–CDifferent letters indicate significant differences at (c) P < 0.001 and (d) P < 0.003.
