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Scrotal circumference (SC) and semen quality (sperm motility and morphologic abnormalities) of 18 month Nelore bulls were studied, in order to gather information that will help the selection of Nelore buli calves for reproduction purposes. Average scrotal circumference was 24.8 ± 2,7cm; of which 54% presented SC below 27.0cm. Thirty-four percent of the bulls presented oligospermia or azoospermia. Most of the animais with SC below 23.0 em (94.8%) presented oligo/azoospermia. A significant difference (p<0.05) was found between the SC averages of bulls with dense and oligospermic semen; as well as (p<0.05) between the SC ayerages of bulls with oligospermia and azoospermia. The average percentage of progressiva motility and morphologic abnormalities on the semen of 18 month Nelore bulls was 51.4± 7.2% and 65.6±5.4%, respectively. There was a significant difference between the averages of sperm motility (p<0~05) and morphologic abnormalities of animais with SC 323<27 e 327cm. The correlations between SC and sperm motility and between SC and morphologic abnormalities were r=0.34 .and r= -0.46, respectively. lt can be concluded that most 18 month Nelore bulls are in puberty, however the quality of semen is still poor. The SC can be considered an efficient method of buli calves selection for it revealed a correlation with the semen quality parameters studied herein.

Circunferência escrotal e características do sêmen de touros Nelore aos 18 meses de idade