Recently picked up 4 Herefords (3 year olds) from a guy I know for $1,100. He said the vet preg checked them and they were open. I figured for the price I could wait on my return. I put them in with my black angus bull. He definitely bred one I saw it with my own eyes. He hasn't even looked at the cows. They were a little thin. My question is. Could the vet have missed an early pregnancy ? I don't have any vets close that preg check. Or could they just need some more weight? They all had calf's last year. Thanks. I was thinking of taking them away from the bull and putting them in a foot tall grass pasture I have for a couple months and then putting them back.