I have a 1 1/2 month old calf that seems to have a cough. He nurses well, has been a sleepy boy since birth but over the last few days seems to be coughing and looking sickly. He looks a little weak too. We listened to his lungs, which sound clear. We gave him 4cc of penicillin last night, this morning he looked a lot better, tonight he was coughing again, head down and looking sick, so we gave him another 4 cc of penicillin. We really don't have a cattle vet in the area, as the good ones are gone or switched over to horses as they say cattle just doesn't pay. Do you guys or gals have any suggestions? Another type of medicine that might work better?