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I agree!  I used to feed alfalfa pellets in the winter...did that all of one winter before I realized how quickly the pellets molded in storage and this is the same storage I've always used for all feeds without getting mold problems.  And it molded rather quickly!  I think it has a high sugar and also a high moisture content...both are recipes for increased mold growth, so they may contain the wrong kinds of mold before you even add them in the mix.  Keep in mind they have to be steamed to get them into that extruded form of a pellet or to be formed into a cube, so adding warm steam to alfalfa might just boost the high mold content. 
 
Another little note to those trying to avoid GMO sourced feed ingredients, alfalfa is on the list of one of the most frequent GMO sourced crops.
 
Maybe by next winter you could have some grow frames of grass going in the run, with plastic tunnels to improve growth through the winter, that may give the birds the greens you like them to have.  You could even sprout grains right now to give them some of the same benefit.
 
But..yeah..I'd toss that mix.  Sorry.