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Methods for Solids-Not-Fat and Protein Determination

Dairy Cattle Research Branch, Animal Husbandry Research Division, ARS Agricultural Research Center, Beltsville, Maryland

ABSTRACT

A great deal of work has been done on methods of measuring milk constituents since the last symposium sponsored by the Association in 1960. I do not intend, however, to give a comprehensive review of this work. I seriously doubt that any of you wish to listen to a detailed review. Furthermore, there are good reviews in the literature, some fairly recent (4, 24, 25). My task will be to focus attention on some of the problems in regard to methods and to summarize the present situation wherever possible.

The first question usually asked about a testing method is, "How accurate is it?" Often the answer is, "that depends." Some have different ideas of what accuracy is. Some confuse precision with accuracy. I know that most dictionaries consider these words to be synonyms. For our purposes, however, I think Youden's definitions are the appropriate ones (34).