Morphological changes in the gonads of the Sabi ram experimentally infected with Trypanosoma congolense.

Indigenous Sabi rams of Southern Africa were experimentally infected with Trypanosoma congolense for 8 and 16 weeks. Testes weights (g) were significantly (P<0.05) lower in the infected (249.7+/-26.4) compared to the control (372.63+/-19.4) animals. Histopathological and ultrastructural changes included seminiferous tubular atrophy and mononuclear infiltration in the testis, and lesions in the epithelium of the corpus epididymidis (middle segment) as well as spermatozoa in the cauda epididymidis. The gonadal lesions may have the capability to impair fertility in Sabi rams infected with Trypanosoma congolense.