659. Factors influencing the vitamin content of milk fat: V. Changes in vitamin A and carotenoid content of the blood plasma of cows and heifers near parturition in relation to secretion of these substances in the milk fat

Author:

Thompson S. Y.,McGillivray W. A.

Abstract

1. Plasma levels of vitamin A and carotenoids prior to and following parturition have been followed in groups of cows and heifers maintained under typical New Zealand farming conditions.2. Despite the high carotene intake prior to calving, the cows, and to a lesser extent the heifers, showed decreases in plasma vitamin A and carotenoid level at or near to parturition, the decreases in the levels for the cows being of the same order as those reported in Great Britain and the United States.3. Although the concentration of vitamin A and carotenoids was higher in the colostrum of heifers than of cows, the total daily secretion of these components by the cows was much greater over the first few days of lactation.4. Evidence is advanced to support the suggestion that the decrease in plasma components is related to the extra drain of colostrum synthesis rather than to any hormonal changes associated with parturition.We are indebted to the following: the Department of Scientific and Industrial Research for financial assistance towards the cost of this investigation; Mr R. M. Patchell and the farm staff of The Dairy Research Institute for the collection of milk samples; Miss Fay Frecklington for help with much of the analytical work; one of us (S.Y.T.) to the Royal Society, the Nuffield Foundation, and the Board of The Dairy Research Institute (N.Z.) for a travelling fellowship during the tenure of which the work reported here was carried out.

Publisher

Cambridge University Press (CUP)

Subject

Animal Science and Zoology,General Medicine,Food Science

Cited by 14 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Untersuchungen zur Beziehung zwischen ß-Carotin im Blut und in der Milch bei Kühen;Zeitschrift für Tierphysiologie Tierernährung und Futtermittelkunde;2009-10-09

2. THE STATUS OF BETA-CAROTENE AND VITAMIN A IN QUEBEC DAIRY HERDS: FACTORS AFFECTING THEIR STATUS IN COWS AND THEIR EFFECTS ON REPRODUCTIVE PERFORMANCE;Canadian Journal of Animal Science;1987-09-01

3. Reproductive and Metabolic Characteristics of Dairy Cattle Supplemented with β-Carotene;Journal of Dairy Science;1984-06

4. Mammals;The Biochemistry of the Carotenoids;1984

5. CAROTENOIDS AS FOOD COLORS;Carotenoids as Colorants and Vitamin A Precursors;1981

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