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Carotene, Vitamin A, and Ascorbic Acid in Mare's Plasma¹

Michigan Agricultural Experiment Station

Abstract

Determinations of plasma carotene, vitamin A and ascorbic acid were conducted on horses over a period which included a change from winter to pasture rations. The mean value for carotene over the entire period was 97.0 ±78.0 micrograms percent. The value in the prepasture period was 34.6 ± 24.6 micrograms percent, and the mean value for the pasture period was 134.9±71.0 micrograms percent.

The mean vitamin A value for the plasma was 12.5±3.5 micrograms percent. The comparison for the prepasture and pasture periods was 12.8±3.6 and 12.5±3.4 micrograms percent respectively. Thus it appears that the horse is inefficient in the conversion of carotene to vitamin A and has normal plasma values considerably below that of the cow.

The mean ascorbic-acid value for the entire period was 0.53±0.17 mg. percent, and 0.42±0.17 and 0.59±0.16 mg. percent respectively for the prepasture and pasture periods.

No correlation was evident between plasma carotene and vitamin A or plasma vitamin A and ascorbic acid.

¹ Published with permission of the director of the Experiment Station, East Lansing, Mich., as Journal Article 674 (n.s.).

² Section of Chemistry.

³ Section of Animal Husbandry.