A study of seasonal variation in butter fat

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Abstract
The absorption of the fatty acids of butter fat at 230 m[mu] is more than doubled during the summer pasture mos. and approximately parallels the increased inhibitory power of butter fat in the SbCl3 reaction for vit. A. The inhibiting substances are much more sensitive to oxidation and irradiation than those responsible for 230 m[mu], absorption. The increased absorption of the acids from summer butter fat must be ascribed either to the nresence of small amts. of unrecognised acids possessing high ext. coef. or to the presence of modified forms of known unsaturated acids in a highly absorbing state.