Effects of vaccination against reproductive diseases on reproductive performance of beef cows submitted to fixed-timed AI in Brazilian cow-calf operations》.pdf

Theriogenology 79 (2013) 242–248 Contents lists available at SciVerse ScienceDirect Theriogenology journal homepage: Effects of vaccination against reproductive diseases on reproductive performance of beef cows submitted to fixed-timed AI in Brazilian cow-calf operations F.H. Aono a, R.F. Cooke b, A.A. Alfieri c, J.L.M. Vasconcelos a, * a Departamento de Produção Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil b Eastern Oregon Agricultural Research Center, Oregon State University, Burns, Oregon, USA c Departamento de Medicina Veterinária Preventiva, Centro de Ciências Agrárias, Universidade Estadual de Londrina, Londrina, Paraná, Brazil a r t i c l e i n f o a b s t r a c t Article history: The objectives were to assess incidence of pregnancy losses, associate this outcome with Received 5 July 2012 immunization programs against reproductive diseases, and evaluate the effects of vacci- Received in revised form 13 August 2012 nation against bovine herpesvirus-1 (BoHV-1), bovine viral diarrhea virus (BVDV), and Accepted 14 August 2012 Leptospira spp., on reproductive efficiency of Brazilian cow-calf operations. In experiment 1, 7614 lactating Nelore cows from 18 ranches were assigned to the same estrus Keywords: synchronization and fixed-time AI protocol (ESFTAI; Days 11 to 0). Pregnancy status was Beef cows determin