Morphological features of the seminiferous and cauda epididymides epithelia of breeding zebu bulls with normal and decreased testicular consistency.

摘要

The fine morphology of the testes and epididymes of 11 breeding Brahman bulls with normal or decreased testicular consistency (TC) at clinical palpation was studied. The bulls were 36-42 months of age and were reared under extensive conditions in the north-dry Pacific region of Costa Rica. The ultrastructure of testes with a slight to moderate reduction in consistency showed more obvious, albeit slight, degenerative changes in the seminiferous epithelium, with cellular debris present in Sertoli cells, compared with controls showing normal consistency at palpation. Abnormalities in the condensation of the chromatin and acrosomes during spermiogenesis were commonly found in cases of decreased TC. The cauda epididymides of these bulls did not show clear morphological deviations compared with controls, although the macrophagic activity of the epithelium was more pronounced, and cell debris as well as foreign cells were apparent in the lumen. The morphological findings confirm the relationship betweena decreased TC at clinical palpation and the lowered normality of the testicular parenchyma, thus supporting the value of palpating scrotal contents as part of the field andrological clinical evaluation of breeding zebu bulls in the tropics.