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Monthly Variations in the Composition of Milk

Department of Dairy Husbandry, University of Illinois, Urbana, Illinois

ABSTRACT

The average values for the composition of 2,426 milk samples, based upon the weight of milk produced, are tabulated according to breed of cow and month in which the samples were taken. The samples were distributed as follows: 208 samples of Ayrshire milk, 428 samples of Brown Swiss milk, 321 samples of Guernsey milk, 268 samples of Holstein milk, 199 samples of Jersey milk and 1,002 samples of milk from Guernsey-Holstein crossbred cows (the Bowlker Herd).

On account of the number of samples included and the distribution of the samples through the lactation periods of individual cows of the different breeds, the author believes that the variations shown fairly represent the milk of each breed of cows studied and that the variations shown for all samples taken together are similarly representative of the mixed milk of large numbers of cows of all breeds.