We have been raising bottle calves and this "older" batch is 4-8 months old. We have (had!) about 9 (now 7) that look pretty bad. We wormed them (injection + drench from the vet) about 10 days ago, probably quite a bit later than we should have, as I am figuring they were quite wormy. Two mornings ago, one of them--4 month old Jersey bull-- was lying dead by the feed trough. He was up and eating the night before, but skinny. Next morning, 4 month old Jersey heifer also dead. All others are Holstein mix. Several look very sickly. They have hay + crushed feed every day. They also seem to be losing their appetites. We are NOT novice bottle-calf raisers, and we have never experienced anything quite like this. Thanks for help and advice.