Over the last two days, we have had two cows calve (Friday and Sunday). Both cows had no problems and we were there for both in case they needed assistance. The cows had the calves within 30 minutes of the water sac showing. Calves were stillborn; no signs of life after being tickled in the nose and hung upside down. Both calves had strange looking umbilical cords. The second calf had what looked like a herniated navel filling up the space between the hind legs (about the size of a calf head). Left the calf with the mother to stimulate contractions to expel the placenta. When we went back to check ion her an hour later the swelling between the legs was gone and it looked like there was a hole in the umbillical cord where it had been. I guess what we're trying to get at is if anyone else has seen anything like this before. We have had two successful calvings, both out of the two sires that the other cows are bred to.Could this be a coincidence that both had stillborn births or could it be environmental? I will be calling the vet tomorrow.