USDA-ARS U.S. Meat Animal Research Center 1 article published in JoVE Environment Lab-Scale Model to Evaluate Odor and Gas Concentrations Emitted by Deep Bedded Pack Manure Mindy J. Spiehs1 1USDA ARS U.S. Meat Animal Research Center A protocol has been developed to measure gases, odors, and nutrient composition in lab-scaled bedded manure packs, which can be used to study ways to improve air quality in commercial cattle facilities using deep-bedded manure packs.