It is important that birds when arriving, find everything in sequence, therefore the ideal condition for the avcola population is the total absence of diseases, and in the majority of the regions it is impossible to eradicate the diseases and if it must cheat control, by means of the good handling, drugs, hygiene and vaccinations, being that each one of these factors plays its role. 3. The CLIMATE For the cut poultry keeping, for the most part prefers regions of dry climate and temperature amena of the year. As the commercial poultry keeping is super intensive, the adverse conditions of climate can in part be eliminated or be attenuated, that is: if the general climate of the region (macro climate) will have some adverse element, can microclimatic correct these inconveniences through the use of aviaries constructed with adequate ways of protection. It is considered that in regions of more favorable macroclimate, the necessary measures of protection are more simple and more economic, and the inverse one can occur. Theoretically the poultry keeping can be developed in any part of the world, any that are the reinantes climatic conditions, in the practical one, what it will go to vary are the costs, the complexity and the handling of the installations, but by more favorable than either the climate, some item must be observed to if to define the localization of a creation of birds for cut, being aimed at the reduction of the installation costs, as well as the easiness in its handling, what in it finishes instance, provides to minor cost of the end item. In the production of chickens the environment is of extreme importance, and three factors if they detach in its composition: Temperature, Relative Humidity and Ventilation, being that birds have different requirements as the age. It has evidences of that other factors can also interact causing estresse, as: electromagnetic radiations, fields, pressure of air, ambient noise, pollutant components of air, etc.