@article{Perry_Geary_Walker_Rich_Northrop_Perkins_Mogck_Van Emon_Zezeski_Daly_2018, title={Influence of vaccination with a combined chemically altered/inactivated BHV-1/BVD vaccine or a modified- live BHV-1/BVD vaccine on reproductive performance in beef cows and heifers}, volume={52}, url={https://bovine-ojs-tamu.tdl.org/bovine/article/view/101}, DOI={10.21423/bovine-vol52no1p53-58}, abstractNote={<p>A field trial was conducted on 10 herds of previously- vaccinated cows and heifers (n=1,567) to evaluate the reproductive effects of prebreeding vaccination with either a modified-live virus (MLV) or a chemically altered/inactivated (CA/IV] BHV-1/BVDV vaccine. Animals received a single (cows) or 2 injections (heifers) of either vaccine, with the final injection between 27 and 89 days before breeding, which consisted of timed AI following a 7-d CO-Synch + CIDR synchronization. Conception rates to AI were greater in the CA/IV vaccine group compared to the MLV vaccine group (P=0.05; 60% vs 52%). Interval from vaccination with either vaccine until AI also influenced conception rates (P=0.02), with animals vaccinated 27 to 29 (52%) days or 30 to 37 (52%) days prebreeding exhibiting decreased conception rates compared to animals vaccinated 46 to 89 days prebreeding (P<0.03; 64%). There was no treatment by interval interaction (P=0.79), effect of treatment (P=0.18), or treatment by interval interaction (P=0.17) on breeding season pregnancy rates. In summary, vaccination of previously vaccinated beef cows and heifers with a MLV vaccine pre-breeding (27 to 89 d) was associated with decreased AI conception rates compared to a CA/IV vaccine.</p>}, number={1}, journal={The Bovine Practitioner}, author={Perry, George A. and Geary, Thomas W. and Walker, Julie A. and Rich, Jerica J. J. and Northrop, Emmalee J. and Perkins, Stephanie D. and Mogck, Christina L. and Van Emon, Megan L. and Zezeski, Abby L. and Daly, Russell F.}, year={2018}, month={Feb.}, pages={53–58} }