By W J Miller
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Vol. 1. Oregon State Univ. Bookstore. Cunha, T. J. (1975). Feedstuffs 47(53), 8 and 37. Dairy Council Digest (1976a). 47, No. 1. Dairy Council Digest (1976b). 47, No. 5. Ely, L. , and Μ. E. McCullough (1975). Ga. Agric. Res. 17, 9-13. Foley, R. C , D. L. Bath, F. N. Dickinson, and H. A. Tucker (1972). " Lea & Febiger, Philadelphia, Pennsylvania. Harshbarger, Κ. E. (1975). Nutr. News 38, 9 and 12. Hodgson, H. J. (1977). Hoard's Dairyman 122, 591, 599, and 600. Ingelfmger, F. J. (1967). Nutr. Today, pp.
CAUSES AND E F F E C T S O F AN E N E R G Y DEFICIENCY The suggested energy requirement recommendations (see Appendix, Tables 1, 2, and 3) (NRC, 1978) are believed to be sufficient for optimum performance under typical conditions in the United States. These energy levels will not neces sarily result in either the maximum rates of growth or of milk production which might be achieved with ad libitum feeding of a high energy ration, especially over short time periods (NRC, 1978). As is true with all nutrient requirements, there is no sharp demarcation line between adequate energy and insufficient energy intake.
For many nutrients, especially certain minerals and vitamins, the experimental 18 1. Introduction and Utilization of Nutrients by Dairy Cattle data needed to calculate requirements by the factorial method have not been obtained. Likewise, determining the maintenance requirement for some nutri ents, especially certain minerals, presents difficult technical problems. The feeding experiment method for determining the requirement of a nutrient consists of feeding various known quantities of the nutrient and studying the response and performance of the animals.