Best hanging fire till you find out what you fighting. I’ve been where you are and it’s not great. We’ve had runs like that in the past with bought in calves to the point we gave it up and now buy yearlings or older instead. We tried micotil draxxin now we use alamycin and a drop of metacalm if we get bother which we do but not near as bad. Our home bred calves have also been a problem for years been vaccinating for ibr rsv pi3 pasturella still had bother. Then we started looking through old lab reports common theme IBR. Then we tested a sample of cows some that had calves with pneumonia some that have calves die from pneumonia and some that had healthy calves so from the results now we vaccinate the cows and after 3 years I’d say it’s starting making a difference to our calf health. So maybe you need to look at that.
Mac
Mac