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Journal of Dairy Science Vol. 21 No. 1 41-44
© 1938 by American Dairy Science Association ®
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Some Observations on the Vitamin A Value of Butter Produced under Drought Conditions1

Bernice L. Kurnerth and W. H. Riddell

Kansas Agricultural Experiment Station, Manhattan, Kans.

ABSTRACT

Vitamin A values, determined by physical-chemical methods, are reported for butter samples produced under drought conditions. One group of Holstein cows had been maintained in dry lot for a period of two and a half years on a ration of prairie hay (approximately No. 2 upland) and grain mixture made up of equal parts white corn, wheat bran, and cottonseed meal. Other samples were secured from the station Holstein herd after the abnormally dry summer of 1936 This herd had received a ration of alfalfa hay, sorgo silage and a grain mixture with very little pasture since the previous spring. Values are also reported for commercial samples churned about the same time in the college creamery from patrons' milk produced under somewhat similar feeding conditions.

The vitamin A value of the butter produced by the experimental herd in dry lot was approximately 11 I.U. per gram or less than one-fourth the values computed by Sherman for butter produced under good feeding conditions. The vitamin A value of the beta carotene of this sample averaged only 30 per cent of the station herd samples.

The samples from cows in the station Holstein herd following the abnormally dry summer of 1936 showed vitamin A values averaging approximately one-half normal figures.

Commercial samples secured at the same time and produced under similar feeding conditions gave comparable values.

FOOTNOTES

1 Contribution No. 74 from the Department of Home Economics, and Contribution No. 119 from the Department of Dairy Husbandry.






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Copyright © 1938 by the American Dairy Science Association ®.