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Standardization of Johnsen scores in the seminiferous tubule cross-sections of roosters stained with hematoxylin and eosin (H&E). (A) Johnsen score of 10 (complete spermatogenesis and perfect tubules); (B) Johnsen score of 9 (many spermatozoa present and disorganized spermatogenesis); (C) Johnsen score of 8 (only a few spermatozoa present); (D) Johnsen score of 7 (no spermatozoa, but many spermatids present).
