Technical Abstract: Research conducted in the Biological Engineering Research Unit at the U.S. Meat Animal Research Center examines animal responses to stressors. These studies require dynamic measurements of both physiological and environmental parameters. This paper describes current methods of monitoring feeding behavior, body temperature, activity, respiration rate, and heat production, as well as the measurement of humidity and a modification to calorimeter environmental controllers to provide cyclic temperatures. Application of recent analytical techniques for evaluating dynamic response measures are also discussed.