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Difference Between Hay and Straw. Very often you would come across people who use the words straw and hay as synonymous with each other. Like several other debates, the confusion between hay and straw is ongoing. But this has been clearly identified by the California Straw builders Association, âHays is for horses, straw is for housesâ. Popularly, alfalfa or clover which is cut, dried and used to feed farm animals is hay.
Straw is derived from grasses and is regarded as a renewable building material since its primary energy input is solar and it can be grown and harvested. Straw bales were first used for building over a century ago. Straw is the springy tubular stalk of grasses like wheat and rice that are high in tensile strength. It is not hay, which is used for feeding livestock and includes the grain head. Straw is composed of cellulose, hemicellulose, lignins and silica.