The sexual precocity was studied on 79 Nelore pure breed bovine males ten to 16 month of age. All animals were avaluated for scrotal circumference (CE), testosterone concentration (Testo) and onset of the first spermatozoa in the ejaculate. The results indicate that 18,5% of males exhibit the first spermatozoa at 306,17 ± 2,42 days, 19,75± 0,9 cm of scrotal circunference and a testosterone concentration of 1,57± 0,9ng/ml. According to the onset of the first spermatozoa in ejaculate, these males showed puberty at 365,39± 1,13 days and the maturity at 487,38± 3,08 days. The results indicate the existence of Nelore pure breed males presenting sexual activity at ages bellow that described in the literature, therefore beeing considered precocious.
age of first spermatozoa; scrotal circumference; puberty; bovine; Nelore breed
