Fig. 3

The blood activity as measured by NBT assay. Activity measured in chicken fed with SBR for 21 d (light gray) and 42 d (dark gray). All the results were calculated on the estimation of 1000 leukocytes. Different letters indicate significant difference (P < 0.05) among the groups at d 21 and d 42. * indicates significant differences between d 21 and d 42 among groups. Dash line shows linear relationship between the SBR concentration and mean NBT on d 42. The results are reported as a mean ± SD (n = 6) from duplicate samples