Hay is Dried feed consisting of the entire plant that can be used a feed for ruminant animals. Alfalfa, clover, grass, and oat Hay are used in dairy rations.
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A Hay is the product of any of a variety of perennial crops, typically grasses or legumes, that can be used a feed for ruminant animals.
Other /More definition:
Hay is Dried feed consisting of the entire plant. Alfalfa, clover, grass, and oat Hay are used in dairy rations.
List of books: Hay