Comparative studies on the efficacy of Mycoplasma gallisepticum bacterin and tiamulin treatment of breeder layer

animal diseases aves de corral bacteriose bacterioses bacteriosis control de enfermedades disease control disease prevention drug therapy enfermedades de los animales maladie des animaux mycoplasma gallisepticum poultry tiamulin tiamulina tiamuline vaccin vaccination vaccines vacuna volaille