I'm new to these boards,but have a problem. I've lost 3 calves in the last month. They are born fine, up and walking. Then about the 3rd or fourth day I will find them lethargic and barely able to stand. No signs of scours. Then in about a week, they die. First calf lived about 10 days and died. Gave him scour tablets, thought it may be scours,but not obvious. Second calf was up and running around, then three or four days later I found him lying down, didn't think much about it but the next day was laying in the same place and I knew something wasn't right. Calf was lifeless. Died the next day. Third calf was born in cold and snow but was up and moving around. Again no concern. Four days later I found him laying down all day. Went over to see about him and he could barely stand, lifeless. Gave him electrolytes and a shot. Next day some better even standing on his own. I gave him milk replacer. Next morning he was up and I hoped for the best, That afternoon was dead. He lived 1 week. Been told possibly E coli. Never had this happen before. My farm is in Middle TN. Incidentially, 2 calves were on 1 farm and 1 was on another by two different bulls. Any advice or suggestions would be greatly appreciated. Thanks!!!!