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A Breed Comparison in the Vitamin D Content of Milk with Notes on a Modified Technique for the Vitamin D Assay of Low-Potency Fats and Oils^*

Department of Dairy Husbandry, South Dakota Agricultural Experiment Station, Brookings, South Dakota

ABSTRACT

Information on breed differences in the vitamin D content of milk is decidedly meager. Bechtel and Hoppert (1) have reported an extensivestudy of seasonal variations of vitamin D in normal cow's milk. Holsteins and Guernseys were included in this study so some comparisons are possible between these two breeds. Normal herd management was employed so no information is available as to the actual vitamin D intake. Under these conditions the authors noted that there was little difference in the antirachitie potency of the milk fat of the two breeds. They pointed out that the higher percentage of fat in the Guernsey milk largely accounted for the higher vitamin D potency per quart of milk for this breed. The vitamin D values for the Guernsey milk varied from 4.8 to 43.8 U.S.P. units per quart whereas the extreme values for the Holstein milk were 3.1 to 27.7 U.S.P. units per quart.

^* Approved for publication by the Director of the South Dakota Agricultural Experiment Station as Journal Series No. 181.