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The Vitamin A and Carotene Content of Market Butter Produced in Kansas¹

Kansas Agricultural Experiment Station, Manhattan

ABSTRACT

1. The 1944 mean annual vitamin A potency of Kansas butter was 15,100 I.U. per pound. The mean for the period December to April was 11,050 I.U. per pound, and from May to November, 17,700 I.U. per pound.
   
2. In the above periods carotene accounted for 19.6 per cent, 14.9 per cent, and 21.4 per cent of the total vitamin A potency of Kansas butter.
   
3. The vitamin A and carotene content of butter produced in different areas of the state and during different months of the year varied with the pasture available. When little or no pasture existed the values for vitamin A and carotene dropped. Good pasture conditions increased the vitamin A and carotene values to maximum in May and June. During the hot summer weather the values dropped off somewhat, returning to higher levels when pastures improved in the fall of the year.
   
4. No correlation was found between the Nafis color grade or butter score and the vitamin A potency of butter.
   

¹ Contribution No. 302, Department of Chemistry, and No. 161, Department of Dairy Husbandry.