Case of a cryptorchid left testis in a European bison: Histological and morphometric description

The aim of the present study is a histological evaluation and morphometric measurement of seminiferous tubules, testis and the epididymal duct collected from a 3.5-year-old male European bison Bison bonasus (L.) with a cryptorchid left testis. In a microscopic preparation collected from the normal right testis of this animal, spermiogenesis with visible late spermatids was observed in the germinal epithelium of the seminiferous tubules, whereas in microscopic preparations from the left testicular cryptorchid, spermatogenesis in the seminiferous tubules appeared to be impeded. The diameter, area and perimeter of seminiferous tubules and the epididymal duct of the cryptorchid left testis and cryptorchid left epididymis were considerably smaller than those of the normal right testis and normal right epididymis of the bison.

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