Evaluation of vulvovaginal lesions, ciclicity and fertility rates of extensively bred Nelore (Bos indicus) cows seroreagent to infectious bovine rhinotracheitis in a farm in the state of São Paulo, Brazil - Gregory, Lilian; Genovez, M; Carneiro, P; Pacheco, W; Oliveira, J; Del Fava, Cláudia; Pituco, E; Stefano, E; Duarte, F; Calil, F (World Buiatrics Congress, 2004)