NCBA: Tips to rebuild the cow herd Zoetis veterinarian describes how producers can expand the herd safely and efficiently9 April 2024 9 April 2024 3 minute read 3 minute read By: By: Lee Williamson North AmericaDr. Dan Tracy, beef technical services veterinarian with Zoetis, recently spoke to The Cattle Site’s Sarah Mikesell at the NCBA Cattlemen's Convention in Orlando, Florida, USA. Let's talk about cow herd expansion. What disease can sneak into a cow herd? If we bring in pregnant heifers, or if we buy some good heifers with genetic merit. The bull is the one common thing that the cow herd shares so asking the important safety questions is critical.