Obviously barley in your case, but "middlings" usually refers to wheat. Definition might be useful for clarification (and in support of Ron's answer). Link on
http://www.nidera.com/Dictionary/gettext.aspx?id=87 takes you to
http://www.nidera.com/Dictionary/gettext.aspx?id=747, where "middlings" is defined thus:
"A by-product of the milling of wheat, consisting of fine particles of bran, wheat shorts, wheat germ, wheat flour and other materials at the completion of milling. Middlings must contain no more than 9 1/2% of crude fiber."
For info, there's also a wikipedia entry for "wheat middlings"
http://en.wikipedia.org/wiki/Wheat_middlings
The translation workplace 
peer agreement (net): +1
