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Journal of Animal Science, Vol 68, Issue 8 2340-2344, Copyright © 1990 by American Society of Animal Science

JOURNAL ARTICLE

Taste aversion learning in horses

K. A. Houpt, D. M. Zahorik and J. A. Swartzman-Andert
Cornell University, Ithaca, NY 14853.

The ability of ponies to learn to avoid a relatively novel food associated with illness was tested in three situations: when illness occurred immediately after consuming a feed; when illness occurred 30 min after consuming a feed; and when illness was contingent upon eating one of three feeds offered simultaneously. Apomorphine was used to produce illness. The feeds associated with illness were corn, alfalfa pellets, sweet feed and a complete pelleted feed. The ponies learned to avoid all the fees except the complete feed when apomorphine injection immediately followed consumption of the feed. However, the ponies did not learn to avoid a feed if apomorphine was delayed 30 min after feed consumption. They could learn to avoid alfalfa pellets, but not corn, when these feeds were presented with the familiar "safe foods," oats and soybean meal. Ponies apparently are able to learn a taste aversion, but there were constraints on this learning ability. Under the conditions of this study, they did not learn to avoid a food that made them sick long after consumption of the food, and they had more difficulty learning to avoid highly palatable feeds.


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J. A. Pfister, B. L. Stegelmeier, C. D. Cheney, and D. R. Gardner
Effect of previous locoweed (Astragalus and Oxytropis species) intoxication on conditioned taste aversions in horses and sheep
J Anim Sci, July 1, 2007; 85(7): 1836 - 1841.
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