COMPARATIVE ANDROLOGIC EVALUATION BETWEEN NELLORE AND BRANGUS BULLS

Welington Hartmann; João Filipi Scheffer Pereira; Tiago Roberto Grochoski; Clóvis Juk Fazzano; Ronerio Augusto Bach

Welington Hartmann Universidade Tuiuti do Paraná
João Filipi Scheffer Pereira Universidade Tuiuti do Paraná
Tiago Roberto Grochoski
Clóvis Juk Fazzano
Ronerio Augusto Bach

Palavras-chave: Cattle breeding. Andrologic examination. Bovine breeds

Resumo

The study was carried out at a farm in the region of Araçatuba, State of São Paulo, from August 1 to October 20, 2017. Thirty-five Brangus and ninety-three Nellore bulls were evaluated, at the recommended andrological exam parameters, such as: scrotal circumference measurement, motility, whirl, force, and evaluation of spermatic pathology. Mean scrotal circumference values were: 37.61 (± 2.50) for Brangus and 35.18 (± 2.08) for Nellore. It was observed a tendency to increase scrotal circumference according to age, and it is possible to estimate using the linear regression equation: y = 0.538x + 28.80 for Brangus, the determination index (R2) was 0.83 and the correlation (r2) between the variables was 0.91, and for Nellore bulls, y = 0.584x + 20.24, R2 = 0.771 and r2 = 0.87.