It is used as an additive mainly for cattle, swine and poultry. 

Producers consider zeolite essential for improved feed conversion, reduced bloating and digestive upsets and less odorous manure. In fact, some operations are now claiming nitrogen conservation in manure with zeolite in order to obtain environmental permits (19,20) and for sales of improved manure/soil amendments. Sales of zeolites in the United States for animal feed use has lagged behind much of the world, however annual sales are greater than 30,000 tons and are growing rapidly as feed mills and producers become aware of its benefits.