High-rise laying hen rearing facility and method

Atmospheric growing conditions in high-rise animal rearing facilities are improved by spraying liquid alum periodically over the manure collection area. This results in improved high rise animal rearing facilities provided with a liquid alum treatment delivery system for misting or spraying the liquid alum over the manure collection area to strip ammonia gas from the air and to apply a chemical coating on a surface of the accumulated manure which reduces or prevents ammonia volatilization. The liquid chemical treatment comprises an aqueous alum solution containing 1 to about 50% by weight alum, applied at a rate of about 50-250 g of Al2(SO4)3 14H2O per kg of manure as it accumulates. The improved rearing facilities and methods control the atmospheric conditions in the animal rearing area at less than or equal to about 25 ppm ammonia throughout the growing cycle