Whenever one buys bum calves (particularly from a sale) there is a high incidence of FPT (failure of passive transfer). In other words, the calves don’t get any colostrum from mom (or the dairy employees) and therefore have no immunity. In such calves, it’s only a matter of time before they catch something…anything…and croak. There is almost nothing that can be done to keep them alive.
That said, were I in your position, I’d get them on Silver Lining #24 Immune Support and #25 INF-X and keep them on it for awhile.

Use the horse stuff not the dog stuff.
Good luck.
Patrick
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.