Answer:
No. Hay is made of not just one type of grass or legume or grass-legume combination, but rather many possibilities of grass and legume cultivars and varieties and even more possible combinations of the variety of species, varieties and cultivars of grasses and/or legumes that are used in the production of hay. Quality also differs wildly in hay depending on growing conditions, when it was cut, when it was harvested, how it was stored, etc. If you sold your neighbor your hay and you got hay back from your neighbor, the hay you got from your neighbor, no matter if it's the same hay or not, will not be in the same condition, same forage combination, same shape as the hay you gave your own neighbor. Also the hay produced one year on your farm is never the same as the hay produced last year or the year before.
Contributor: Wildrosebeef
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