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A recent paper 1 by Klcinberg presents some 14,000 records of cows in Czechoslovakia, dealing with age, live weight, milk yield and fat yield. Kleinberg's analysis of these records includes an application of the equation, 2 ~ = A + BW and the equation, F = A + BW. One of his three major breed groups and several of his minor age groups give a negative value for A, which indicates that in these particular groups the larger cows produce more milk or more fat per unit live weight than do the smaller cows. This situation is of so much interest that it seems desirable to express the results in terms of a power equation, relating milk-energy yield to live weight. Accordingly, in the present paper Kleinberg's published data are fitted with the equation, FCM=DW e ......
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W.L. Gaines (1940) studied this question.
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