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Comparison of the differences in the immunological parameter in 49-day-old broilers and under different conditions. (a) means the percentage of T-lymphocyte subsets; (b) means the ratio of CD4+ to CD8+. Significant differences exist in the values with lower case letters in the same cluster, of the same breed, at the same age (P < 0.05). Highly significant differences exist in the values with upper case letters (P < 0.01).
