A method for the determination of the fat content of milk from measurements of the turbidities of diluted milk suspensions in the near infra-red region has been shown to provide greater accuracy than the alkali-addition method in the visible region. Variations in results due to breeds of cows and lactation times have been studied, and excluding early lactation samples, the maximum deviation within a given breed was found to correspond to ±0·2% in the fat concentration.
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J. D. S. Goulden (1958) studied this question.
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