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The exam andrologic of the bull is carried out through a series of studies that interrelated they allow to understand the integrity functional anátomo of the same one, each one of them sandal a specific area. The study protocol in an exploration of this type is continued through a methodical pursuit. The palpation, the measure of the escrotal perimeter and the evaluation of the semen provide important information to investigate the reproductive capacity, but they cannot detect potential illnesses. The termography, the tonography and the tersticular biopsy are not so accepted or they involve risks for the reproductive potential of the animal. The ultrasound, as complementary method of diagnosis, allows to carry out an evaluation non invasive of the internal structures of the scrotum and testicle and the chances of diagnosis of focal illnesses and multifocales increase, as scars, neoplasian, abscesses, etc.. This technique, in definitive, offers like a tool exceptionally appropriate for the evaluation of the affections testicle -- escrotales of the bull and he/she is carried out easily with portable teams, offering information about the structure testicular that otherwise one cannot obtain (Pechman and Eilts, 1986). The application of the ultrasonography in equine and bovine is carried out from 1980 and he has given one of the most important steps for the study and understanding of the events anátomo -- physiologic in real time. The experience of the operator in the realization of the technique has a capital importance: it should coordinate the image with the movements carried out with the hand, to detect the interferences and to correct them to obtain a correct result. Individualized the organ, the technician should possess a deep knowledge of the anatomical structures and his appearance ultrasonográfica to evaluate the degree of normality or Present illness (Pierson and Adams, 1995). [ABSTRACT FROM AUTHOR]