I'm about 99% convinced that the bloat isn't caused by anything that therabloat will fix. Therabloat is designed to cure frothy bloat caused by eating alfalfa or clover, and the bloat should disappear within 15 minutes after treatment. Mineral oil (or soap, for that matter!) will do the same thing and be much cheaper. Given the amount of time... you'd probably find the bloat will go away in 2-3 hours if you do nothing, too.
My tenative guess is that the bloat is caused by an overgrowth of some organism in the calf's digestive system.
#1: that would also explain the vet's recommending antibiotics.
#2: a bacterial overgrowth is likely since you mentioned the calf had scours.
Check with your husband to see what antibiotic you're using, and it'll give a better idea of what organism the vet suspects.
My tenative guess is that the bloat is caused by an overgrowth of some organism in the calf's digestive system.
#1: that would also explain the vet's recommending antibiotics.
#2: a bacterial overgrowth is likely since you mentioned the calf had scours.
Check with your husband to see what antibiotic you're using, and it'll give a better idea of what organism the vet suspects.