Abstract
ABSTRACTFour dogs with a history of infertility were found on examination to be azoospermic. Three of the dogs were related (a sire and two male offspring) and investigation revealed that some of their male ancestors had been of reduced fertility. There were degenerative changes in 20–40 per cent of the seminiferous tubules, a proportion of which were associated with a focal peritubular orchitis. There was a complete absence of spermatozoa in the rete testis, the vasa efferentia and the epididymis. The possibility that the condition is of an autoimmune nature is discussed. The unrelated dog had a non‐inflammatory degeneration of tubules with complete absence of spermatogenesis.
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