Environmental factors are generally recognized to have a major impact on raising chicken in the production of meat and eggs from poultry. These include temperature, humidity, light (length of day and intensity), altitude (air pressure and partial pressures of oxygen and carbon dioxide), wind velocity (air movement), solar energy, quality of air and water, and density of population, during the last decade, the influence of environmental factors on poultry have received greater attention so that more reliable baseline values are available Most studies have dealt with only one environmental factor—with other factors presumably held constant. Yet, we recognize that in husbandry practices, be it in- or outdoors, poultry are subjected to a multiple of factors, none held completely constant, and all interrelated