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Hay is made from various forage crops such as perennial grasses and legumes, clover and alfalfa. Once it is cut, dried and baled, it is used to feed livestock.
http://answers.ask.com/Science/Agriculture/what_is...
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If you are talking about the round bales of hay you see around the countryside, they are made with a round baler. See the related link below for more information and some videos.
http://wiki.answers.com/Q/How_are_rolls_of_hay_mad...
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With a round hay baler. The baler is powered by the tractor through the PTO, an electrical control box, and hydraulics, which enables the operator full control over the baler. The
http://wiki.answers.com/Q/How_is_a_round_hay_bale_...
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The first little pig.
http://wiki.answers.com/Q/What_pig_made_its_house_...
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