Abstract
Rapid methods for determining the protein and solids-not-fat (SNF) content of milk are reviewed. The accuracy of the methods is discussed. Most of the cows on test are involved in studies of genetic and environmental factors affecting milk composition. Density methods for SNF and dye-binding methods for protein are most popular and most appropriate for the present research use. Problems involved in developing and standardizing these methods for other uses, i.e. regulation, basis of payment, etc., are discussed. Paper in a symposium.