Seasonal variation in semen quality in Bos indicus and Bos taurus bulls raised under tropical conditions - Nichi, Marcilio; Bols, P. E. J; Züge, Roberta Mara; Barnabe, Valquiria Hyppólito; Goovaerts, I. G. F; Barnabé, Renato Campanarut; Cortada, Carmen Neusa Martins (Theriogenology, 2006)