[Frequency and differentiation of defective spermatozoa in relation to various clinical testicular changes in black-pied Holstein bulls].

: An occurrence of pathological spermatozoa and their differentiation in relation to the clinical state of the testes in the Holstein bulls was studied under the subtropical conditions of Cuba. In animals without clinical testicular findings an average count of pathological spermatozoa was relatively high (16.4%), it increased in breeding bulls suffering from testicular degeneration (22.72%), and it reached the maximum values in bulls with testicular fibrosis (29.52%). Primary defects were mostly found on heads, fewest changes were observed on the neck of spermatozoa. A finding of the set of acrosomal defects was prevalent on the spermatozoon head; the defects were heaviest in bulls with testicular fibrosis. In those animals, a higher frequency of piriform spermatozoon heads was found out. A high incidence of protoplasmic drops was observed as well;it was highest in fibrotic bulls (8.27%). In dependence on the clinical state of gonads, the testis produces an increasing amount of pathological spermatozoa. That is to say the proportionate representation of various defects is similar to each other when given biological excrements at different states of gonads are considered.