thanks guys. I'm 16 years old and was working for my grandfather who owned the farm. my grandfather passed away so my father and i have been managing the farm. we've been pretty successful so far and pretty much know the basics about cattle health and all. this is the only thing ive been questioning. i was worried because i noticed that a lot of the cows that had calved recently and had just been wiened or maybe not even quite wiened from calves yet, were birthing agian. any advice is appreciated, thanks.