especially those fed 1% OligoPKE at 21 DOA, suggesting that OligoPKE supplementation enhances immune system in the broilers. Dietary OligoPKE did not affect lymphocyte, monocyte and eosinophil concentrations in birds at 21 DOA. Conversely,OligoPKE supplementation did not affect all
the hematological parameters measured in birds at 35 DOA. The above result seems to suggest that supplementation
of OligoPKE was more effective in broiler chickens during their younger age when their immune
system was not fully developed (Beal et al., 2004).