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The spermatic changes associated with the natural infection in dogs by Leishmania sp was evaluated during eight consecutive weeks, using ejaculates of six seronegative and six seropositive dogs. The samples were collected once a week and evaluated for volume, concentration, motility, vigor, sperm morphology, chromatin integrity, simultaneous evaluation of the plasmatic membrane integrity, acrosome, and mitochondrial potential. The total proteins of the seminal plasma and blood were measured. The visceral leishmaniasis caused increase of major and minor defects in spermatozoa of animals attacked by moderate to severe stages of the disease. In more advanced stages of the illness, the acrosomal and plasmatic membranes integrity was adversely affected. It was not possible to establish a pattern refering the evaluation of the mitochondrial potential. The incidence of morphological changes in the seropositive animals did not promote an increase of injuries to the chromatin. All animals with leishmaniasis presented hyperproteinemia of the semen.

Measurement of sperm capacitation and acrosome reaction-like changes by chlortetracycline test (CTC) can predict the freezability of ram semen?