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The additional heat production associated with the synthesis and excretion of waste products.  

The additional heat needed to maintain body temperature when the environmental temperature drops below the zone of thermal neutrality. It is the additional heat produced as a result of an animal’s efforts to maintain body temperature when the environmental temperature is either lower or higher than the zone of thermal neutrality. In either instance, excess…

The heat produced in association with the metabolic processes of product formation from absorbed metabolites. In its simplest form, it is the heat produced by a biosynthetic pathway.  

The heat produced in the digestive tract as a result of microbial action. This is an especially important heat component in ruminants.  

The heat produced as a result of the action of digestive enzymes on the food within the digestive tract and the heat produced by the digestive tract in moving the digesta through the tract as well as moving the absorbed nutrients through the wall of the digestive tract.  

The heat produced by the activity of the skeletal muscular system in the course of performing actions such as standing, sitting, walking, running, and so on. Also called the activity increment.  

The increase in heat production associated with the consumption of food in a thermoneutral environment. It includes HdE, heat of product formation (HrE), heat of waste formation and excretion (HwE), and HfE.  

Equations used to estimate basal energy expenditure.  

Organic cyclic compounds containing a fluoride, chloride, iodide, or bromide substituent. Thyroxin is an example.  

Precursor of kallikrein (serine protease) that participates in the production of bradykinin. The Hageman’s factor also participates in the blood clotting process.