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Feeding Standard Equations for Cows and Goats in Milk

University of Illinois¹

Abstract

Conclusions: The following feeding standards for cows and goats in milk are justified, in a practical way, from the data entering into figure 3:

(13)

(14)

(15)

in which DN = daily digestible nutrients intake in pounds, W = live weight in pounds, FCM = daily milk-energy yield in pounds 4 per cent milk. The term in W represents DN for maintenance (DN₁) and the term in FCM represents DN for lactation (DN₂).

In these standards DN₂ is a fixed multiple of FCM throughout (see legend of figure 3 about rats). Net efficiency of lactation (milk calories divided by DN₂ calories) is 62.5 per cent throughout.

Within species DN₁ is proportional to W; as between species DN₁ is proportional to W^.73 (see footnote 8 about meaning of W^.73).

For the comparatively small range in live weight within species, the numerical distinction between DN₁ proportional to W or proportional to W^.73 is too small to be of any consequence in estimating feed requirements.

¹ Department of Dairy Husbandry, Urbana, Illinois.