For the control of Mycoplasma synoviae airsacculitis in chickens and Mycoplasma gallisepticum S6 in chickens and turkeys. In the field tylosin has also proved useful in reducing the level of infection following stress associated with live vaccination. As an aid in the control of outbreaks of necrotic enteritis in chickens caused by Clostridium perfringens. For the prevention and control of enzootic pneumonia, and scours caused by organisms (e.g. Lawsonia intracellularis) sensitive to tylosin, in pigs. For the control of pneumonia in cattle associated with mycoplasmata and Pasteurella multocida sensitive to tylosin.