J. Anim Sci.
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J. Anim Sci. 1967. 26:1030-1038.
© 1967 American Society of Animal Science
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Utilization of the Carotene of Hay by Horses1

P. V. Fonnesbeck and Linda D. Symons

New Jersey Agricultural Experiment Station, New Brunswick

Abstract

Concurrent with two digestion-metabolism experiments with horses evaluating forages, carotene intake, plasma carotene concentration and plasma vitamin A concentration were observed. In one experiment, the hays fed were Lincoln bromegrass, timothy, Alta fescue, Reed canarygrass, Atlantic alfalfa and Pennscot red clover; and, in another experiment, Reed canarygrass, Lincoln bromegrass, orchardgrass, Alta fescue, Midland bermudagrass and Atlantic alfalfa. In both experiments, six mature Standardbred geldings received the six hays for 2-week feeding periods in an experiment of Latin square design.

The carotene intake for the first experiment averaged 166 and ranged from 89 to 299 mg./ day; and, in the second experiment, averaged 231 and ranged from 59 to 645 mg./day. The carotene intake average for both experiments was 198 mg./day. The average carotene intake was not sufficient to maintain the plasma carotene or vitamin A concentrations of the blood plasma during the experiments. The average plasma vitamin A concentration declined to less than 10 mcg./100 ml. in horses in the second experiment, receiving as high as 172 mg. of carotene/day from grass hay. Vitamin A deficiency symptoms were not observed. In the first experiment, a lower carotene intake from alfalfa hay more effectively maintained the plasma vitamin A than that from the grass hays, indicating forage species differences in carotene utilization.

Footnotes

1 Paper of The Journal Series, New Jersey Agricultural Experiment Station, Department of Animal Sciences. New Brunswick, New Jersey.






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Copyright © 1967 by the American Society of Animal Science.