Feeding Standard Equations for Cows and Goats in Milk
- 1 November 1943
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Animal Science
- Vol. 2 (4) , 304-313
- https://doi.org/10.2527/jas1943.24304x
Abstract
The following feeding standards for cows and goats in milk are justified, in a practical way, from the data entering into figure 3: Cows, DN=.008W+.3FCM (13) Goats, DN=.016W+.3FCM (14) Rats, DN=.064W+.3FCM (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.Keywords
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