Prevention and treatment of gastrointestinal and respiratory infections caused by microorganisms sensitive to Enrofloxacin such as: E. coli, Haemophilus, Mycoplasma, Pasteurella and Salmonella spp., causing diseases such as: pasteurellosis, diarrhea and multifactorial diseases such as: atrophic rhinitis, pneumonia, metritis, loss of milk in pigs, buffaloes, cows, goats, sheep.