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A Comparison of the Vitamin A Potency of Milk Fat from Cows Fed on Dry Feed and on Green Pasture¹

Department Of Dairy Industry, Montana Agricultural Experiment Station, Bozeman

ABSTRACT

Milk fat always has been considered an important source of vitamin A. It has been shown by a number of investigators (1, 2, 4, 5, 6, 7, 8, 9, 11, 13, 16, 17) that the vitamin A potency of milk fat is directly related to the carotene content of the feed consumed by the cow. It also has been shown that some breeds of dairy cattle utilize the carotene of the feed more efficiently than others {1, 13,14, 15, 17). A number of investigators have reported rapid increases in the vitamin A potency of milk fat when cows are given access to feeds high in carotene, such as green pasture grass. They also have reported on the length of time required for the milk fat to reach high vitamin A values after the cows have access to green grass. Treichler et al. (16) reported the results on one cow which had been on a vitamin A-free ration for 60 days.

¹ Contribution from Montana State College, Agricultural Experiment Station. Paper no. 247 Journal Series.