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Some Relationships Among the Major Chemical Components of the Bovine Body and their Application to Nutritional Investigations

Department of Animal Husbandry, Cornell University AND The New York Artificial Breeders' Cooperative, Inc., Ithaca, New York

ABSTRACT

The chemical composition of the whole empty body of an animal represents a final state resulting from the influence of heredity and environment. Since, in the usual nutritional or physiological experiment, attempts generally are made to control genetic influences by the use of large numbers of animals, random allotment, replication and other devices, changes in the composition of the body (reflecting storage or loss of chemical components) become valuable criteria of response to the environmental treatments being imposed. It long has been recognized that changes in the concentration of fat, protein, and carbohydrates in the body reflect energy storage or loss and that the exchange of energy may be employed as a criterion of the energy value of feeds for maintenance, growth, and/or fattening.

Several generalizations of biological significance have arisen from studies of the composition of animal bodies. The very early and extensive experiments conducted by von Bezold (33) with mammals, birds, amphibians, fish, and other animals at various stages of development show that animals are composed in a manner characteristic of their species and age.

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