I. Introduction.- Energy metabolism of farm animals.- The Wageningen respiration unit for animal production research: a description of the equipment and its possibilities.- II. Housing-Systems and Energy Metabolism.- Adaptation to, and energy costs of, tethering in pregnant sows.- Metabolic rate of piglets between sucklings.- Influence of some environmental, animal and feeding factors on energy metabolism in growing pigs.- The effects of housing conditions on energy utilization of poultry.- III. Climatic Conditions and Energy Metabolism.- Surface temperatures as parameters.- The influence of climatic environment on sows.- Thermal requirements of growing pigs from birth to slaughter.- A formula to describe the relation between heat production at thermoneutral as well as below thermoneutral temperatures simultaneously.- Effect of environmental temperature and air velocity two days preslaughtering on heat production, weight loss and meat quality in non-fedpigs.- Effects of climatic conditions on energy metabolism and performance of calves.- Climatic conditions and energy metabolism of laying hens.- Climatic environment and energy metabolism in broilers.- Heat tolerance of one-day old chickens with special reference to conditions during airtransport.- IV. Health and Aspects of Energy Metabolism.- Energy metabolism and immune function.- Parasite worry and restlessness caused by sarcoptic mange in swine.- Respiratory diseases in pigs: incidence, economic losses and prevention in the Netherlands.- Mastitis in dairy cows with special reference to direct and indirect effects of climatological factors.- The effect of gastrointestinal nematodes on metabolism in calves.- Energy and nitrogen metabolism of growing calves continuously infected with Dictyocaulus viviparus.- Respiratory diseases in calves.- The effect of a subclinical Haemonchus infection on the metabolism of sheep (a pilot study).- Coccidiosis: a problem in broilers.- V. Variation in Energy Metabolism Characteristics Due to Feeding Level and Differences Between Breeds/Strains.- Effect of feeding level on maintenance requirements of growing pigs.- Genetic variation of energy metabolism in poultry.- Genetic variation of energy metabolism in mice.- Effects of body weight, feeding level and temperature on energy metabolism and growth in fish.