I prefer triticale over rye for grazing. Heads out later than rye and wheat and more leafy.  Triticale does grow less in the winter, but if you are far enough south to make turnips and oats work planted this late than that should not be a problem. Turnips are more winter hardy than radishes and some will overwinter here. Turnips are better for grazing, especially if they are planted early enough to grow a bulb. Cattle will eat the whole bulb. 

Rye is the easiest to kill and triticale is the hardest to kill with roundup.