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Variations in the Gross Composition of Milk as Related to the Breed of the Cow: A Review and Critical Evaluation of Literature of the United States and Canada ¹

Department of Dairy Technology, The Ohio State University, Columbus

ABSTRACT

Research workers and dairy cattle, breeders currently are giving more attention to milk composition than for some years in the past and, consequently, are in need of an adequate survey of the previous work, in order to have a sound basis for future planning. Therefore, a comprehensive review of literature on the composition of milk appears especially appropriate at this time.

Data which served as the basis for many commonly used references to previous work on milk composition seem to have become somewhat obscured with the passing of the years. Therefore, one can not be certain as to the scope, completeness, or reliability of those studies in terms of present-day needs. Indefiniteness of information has led to lack of agreement among workers and authors who are citing these references. Examples of such misinterpretations appear in three instances (39, 41, 49) in which different compositions are reported for the same breed of cows, although all three references cite the same investigation (32) as the source of data.

¹ Article No. 10-58, Department of Dairy Technology, The Ohio State University. Supported by grants from the Floyd Johnston Memorial Fund and the American Jersey Cattle Club, Columbus, Ohio.