Not to speak for you wingnut but he's probably looking for no alfalfa. Those dang minis will colic at the sound of the word colic!!! The grass hay helps to keep them more regular and less chance of impaction. Most horses, mini's included, will eat alfalfa like a hungry kid downing a hot dog in eight seconds. With grass hay they slow down and eat more natural, slower and spaced out. This keeps their system more regular and prevents impaction from eating too quickly. The other problem is that alfalfa is very rich in protein and carbohydrates. The mini's tend to be more stressed than other horses and this will also cause them to colic.