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Journal of Dairy Science Vol. 76 No. 11 3464-3478
© 1993 by American Dairy Science Association ®
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System of Equations for Fulfilling Net Energy and Absorbed Protein Requirements for Milk Component Production

D. R. MERTENS 1 and R. G. DADO 2

1 US Dairy Forage Research Center, USDA-Agricultural Research Service, Madison, WI 53706
2 Department of Dairy Science, University of Wisconsin, Madison 53706

Objectives were to develop a system of equations for formulating rations to meet absorbed protein requirements, to define NEL requirements for individual milk components, and to evaluate the effects of changes in milk composition on requirements for absorbed protein and NEL recommended by NRC or by a proposed system based on milk components. By combining parameters in the NRC degradable protein system, a set of two equations was derived that can be solved to meet absorbed protein requirements when either ruminally available protein or energy limits microbial protein synthesis. Heats of combustion were used to estimate NEL requirements for milk components. Maintenance requirements for absorbed protein and NEL were obtained from NRC. To eliminate the dependence of DMI prediction on milk fat concentration, as assumed by NRC, DMI was estimated using the NDF concentration of the feed and the NEL requirement of the cow. The proposed system of requirements, based on milk components and the matrix of equations for meeting absorbed protein requirements, not only accounts for differences in the degradability and microbial yield of feeds but also more logically matches differences in nutrient requirements for milk components associated with changes in milk composition.

Key Words: absorbed protein • net energy • milk components • ration formulation

Submitted on January 22, 1993
Accepted on May 27, 1993




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Copyright © 1993 by the American Dairy Science Association ®.