Have a calf born 9-28-09, after a day noticed she had mucous hanging out of her nose, she breathed thru her mouth, and saliva hanging from mouth, and rapid breathing. Vet said treat with mycotil and banamine, which I did. The weather was hot at that time(south Georgia). She responded, cleared up and seems ok. Now if she runs, say after the herd to catch up, you can hear her breathing--a rumble like sound or thump-thump, then after a while she settles down and breathing is quiet. Do I give someting new, same treatment again or pursue other possibilities? Thanks for your thoughts.