Feeding growing-finishing pigs diets with reduced (four percentage units) protein concentrations did not reduce odor intensity of the excreta. There was, however, a trend for reduced odor intensity from excreta from pigs fed diets that included 2% clinoptilolite.
Iowa State University
Uygongco, G.; Zimmerman, Dean R.; and Bundy, Dwaine S., "Effects of Reduced Nitrogen Content and Clinoptilolite Supplementation of Diets on Growth Performance, Nitrogen Excretion, and Odor Production" (2000). Swine Research Report, 1999. 10.