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The Nutritive Requirements of the Dairy Cow Expressed in Accord with a New Method of Application of the Net-Energy Conception

Institute of Animal Nutrition, Pennsylvania State College

Abstract

This paper presents a new method of determining the energy requirement of maintenance; a new method and point of view in measuring the energy requirement of milk production; and a new tentative feeding standard. The effect of this added light, however, seems rather to magnify the extent of that which we do not know regarding the nutritive requirements of the dairy cow.

The motive of the writers in undertaking this study derives from their realization that no entirely satisfactory method has as yet been found for measuring net-energy values of feeding stuffs for any purpose, and that in relation to milk production such measurements seem to be attended by insuperable difficulties because of the extent to which the lactating cow can draw upon the nutrients of her own body.

In making this observation it is the understanding of the writers that sooner or later any deficiency of any essential nutrient in a ration must affect the utilization of its energy, the most significant energy value of a feeding stuff being expressed, therefore, only when and as it is present as a component of a completely balanced ration—or as the animal is temporarily protected from nutritive deficiency by drafts upon its nutritive reserves.