Avaliação da aptidão reprodutiva de touros da raça Nelore, com infestação de Dermatobia hominis (Linnaeus Jr., 1781) na bolsa escrotal

Abstract

Dermatobia hominis affects bovines, causing serious economic damages and of productivity for the beef cattle. The occurrence of dermatobiosis and alteration in the fertility of bulls come being currently studied with intention to evaluate its influence on the parameters of the spermatic quality. The objective of this study was to evaluate the clinical analysis of the masculine reproductive system, the testicular perimeter, the physical characteristics as motility, turbidity, intensity and spermatic concentration, and morphology of the semen. For in such a way, 18 bulls of the commercial Nelore race had been used, with age of 36 months, variation of corporal score of 6.0 to 6.5, after pre selection, following the standard of the Manual of the CBRA. The bulls had been placed in two groups: G1 (nine infested with D. hominis larvae on the scrotal skin) and G2 (nine bulls as controls), and they were submitted to the andrologic examinations in the days D24, D48, D63 and D74 and evaluated the testicular and seminal characteristics. The gotten average values of these parameters had been analyzed by the variance test, and results had indicated that it did not have significant difference (p< 0.005). These results indicate that the experimental infestation of D. hominis in the escrotal skin did not influence the spermatic quality of bulls of the Nelore race.