Norm I tend to dissagree. Forbs only doesn't give the wildlife(especially quail) the bunchy cover they need to nest, raise young, and provide bare ground. Forbs only can be just as invasive and thick as a grass only pasture.
The Missouri Dept. of Conservation has done studies on habit quality and quail #'s. A well planted prairie type area w/ good diversity and scattered shrubs out produced everything else in quail #'s.

I'll start treating my wife as good as my dog when she starts retrieving ducks.
http://geocities.com/h20fwlkillr/