A marginally non-significant increased risk of fetal loss was found for animals exposed to BVDV (OR = 2.01; 95% CI = 0.99–4.11) at the ELISA titer of ≤1. Vaccination did not affect ORs for Hardjo or BVDV and no herd vaccinated against N. caninum. Approximately 14.0% of all fetal loss in the beef breeding cattle population in New Zealand may be attributable to BVDV (3.5%), N. caninum (3.0%), Hardjo (4.7%), and Pomona (3.6%).