Effect of shadow availability at pasture on reproductive traits of Nelore bulls (Bos indicus) raised in southeastern Brazil - Bao Tarragó, Octavio Fabián; Rodrigues, Mariana de Paula; Zaffalon, Fabiane Gilli; Andrade, André Furugen Cesar; Fantinato Neto, Paulo; Alonso, Maria Augusta; Arruda, Rubens Paes de (Brazilian Journal of Veterinary Research and Animal Science, 2013)