This is a very comprehensive document from Department of Earth Sciences, State University College, Brockport, NYabout using zeolite in agriculture and includes very interesting information about cattle, pigs and poultry. It is well worth reading in its entirety but if you want to go straight to the Animal Husbandry section, go to page 136.
Grade 2 Zeolite: Fine zeolite powder used in horse and pig feed.
Grade 3 Zeolite: A slightly coarser zeolite powder used in cattle feed, chicken feed, worm farms, turf, gardening, broadacre cropping and to absorb odours.
Contact details for suppliers of BFA certified zeolite: