Glucosamine and MSM (methylsulfonylmethane) are muscle and joint supplements that are usually fed to performance horses. When fed according to manufacturers’ recommendations, it is not harmful to horses. So feeding it to pregnant or lactating mares is not harmful, but there is probably no reason to feed it to those types of horses. They probably have no nutritional need. However, if the mares are older and have joint problems, then glucosamine may help them in terms of being comfortable moving around.
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This work is supported in part by New Technologies for Agriculture Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.
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