I have two cows with 6 mo. old calfs. cows have bloody nose and a bad cough. Calfs only have cough. Its been going on now for two or three weeks. Their on good grass and still eating good. Water comes from a pond. what treatment? What diseases?
I would advise you to call a vet. All you will get here, given that information, are guesses. There is enough money in 2 cows and 2 calves to justify the call if that is what you are looking to do.
