Zeolites can be given to animais it they are reduced in size enough so tney will not give any harm to the animal. Researches show that addition of cfinoptilolite to the diet ongrowth of animals under some conditions provides protecting against ammonia toxicity by binding ammonia and reducing cadmium induced anemia. Clinoptilolite has also the ability to absorb toxic cations like Pb, As, Cd, eto, and thereby prevents or reduces their adverse effects on metabolic functions in animals. 
In animal husbandry, Clinoptilolite based zeolite which is crushed and grinded, mixed with normal animal feed with a ratio of V2°/o to 2%. So zeolite is not a feed material by itself but it is an additive and results in significant changes in many properties. By adding zeolite into fodder, animals gain weight, the conversion rate is decreased (less feed per pound of grain); diseases are reduced; bone growth improved; manure odor is reduced and the number of gradable eggs, value of milk, or meat indexing is increased. Also Clinoptilolite addition to fodder leads to better digestion, activation of certain organs and survival rate.
At present no data is present for the effectiveness of Clinoptilolite over these improvements. However, as the zeolite becomes an ammonium reservoir that allows the animal to more efficiently utilize ingested nitrogen. Other explanations may include the myco - toxin binding ability of the zeolites or the fact that zeolite takes up heavy metals .
In the year 1999, the European Union has authorized the use of ctinoptiiolites either of volcanic or sedimentary origin as a feed-additive in the group of binding and flowing agents.