The<unk>  of<unk>  of ingested<unk>  to unit of body substance (ECI, also termed "growth<unk> ") is an index measure of<unk>  fuel<unk>  in animals. The ECI is a rough scale of how much of the<unk>  ingested is converted into growth in the animal's mass. It can be used to compare the growth<unk>  as measured by the weight gain of different animals from consuming a given quantity of<unk>  relative to its size. The ECI effectively represents<unk> es of both digestion (approximate digestibility or AD) and metabolic<unk> , or how well digested<unk>  is converted to mass<unk>  of<unk>  of digested<unk>  or ECD). The formula for the<unk>  of<unk>  fuel is thus: : These concepts are also very closely related to the feed<unk>  ratio (FCR) and feed<unk> .
Efficiency of food conversion
Closing capacity
Composition of the human body
Initial acquisition of microbiota
Microbiota-accessible carbohydrates
Parafunctional activity
Mechanical properties of biomaterials
Diffusing capacity