I have a small heard of about 35 momma cows (mostly black crossbred)I have 25 calves on the ground right now since i run my angus bull year roundthey are all different ages.The last two one on born on 8-5-05 the other 3 weeks ago lived 3 days and died I know they got there first milk and went down hill from there.I took the first one to the vet and he said she was breathing a little too fast and thought it was BRSV he gave the calf antibotics and told me to give her another shot that evening and call him if she was not nursing the next day.Well that evening i went to give the shot and she was dead.The other one born on 8-5 died also.The day before she died she was strong but her eyes were runny?I am scared now what could this be?