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The effects of the refractive index, the saponification number and the iodine value of milk fat on the differences between fat values as obtained by means of Rose-Gottlieb and infrared methods

, : The effects of the refractive index, the saponification number and the iodine value of milk fat on the differences between fat values as obtained by means of Rose-Gottlieb and infrared methods. Suid Afrikaanse Tydskrif vir Suiwelkunde 22(4): 73-76

Eight Friesland cows, in a 4 x 4 Latin-square feeding trial, were given diets containing 0 and 25% cottonseed. The fat content of the milk was determined according to Rose-Gottlieb (RG) and IR 5.73 (Fa) and 3.48 micro m (Fb) methods. Differences between the values obtained are explained on the basis of the refractive index (Ri), the saponification number (Sn) and the iodine value (Iv) of the milk fat. Ri, Sn and Iv accounted for 55, 52 and 20% of the significant difference between RG and Fa.

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