Veterinarians now recommend leaving a retained placenta alone to avoid harming uterus
Tri State Livestock News
Most cows "clean" soon after calving, shedding placental membranes within 2 to 12 hours. If it takes longer than 12 hours, it is called a retained placenta or retained fetal membranes, according to Dr. Russ Daly (Extension Veterinarian, South Dakota State University). "When I was in practice we didn’t consider doing any kind of intervention until the placenta had been retained up to 72 hours, but our understanding of how best to treat these issues has changed," he says.