I don't think pheasants would survive long term even in Kansas or the Texas panhandle without stackyards, fencerows, and heavy cover. Our most favorite gamebird, is not designed to make it on virgin grasslands or continuous crop, even though un-harvested. The pheasant does not have the nose flairs, or nose breather plugs of the prairie chicken and sharptails, to block the ice storms, If it rains ice, they need to turn to avoid suffocating, then ice gets under their coat and they freeze to death. Need a core of "hard" cover to hold up in. May not need it forever, but at certain times it is critical! So the idea that grain sorghum will suit the bill, maybe a great amount of time, but at at nesting and core winter survival, you need the hard wind blocking, and superior overhead cover to make it through. In the sorghum, of course you will have some of the population survive, but not the vast majority. Same theory as grazing cattle on the plains with out hay, and winter cover! That went out in the 1890's. I suggested as have you there is a relationship between cattle and game birds management, which is not acknowledged by "professionals" who manage gamebirds. cattle breakdown the cover, allow runways in snow cover, pathways in prairie grass, digest some of the corn in feeding programs, but a lot is transferred, undigested to be easy gleaning for the pheasants, the seeds of prairie grass, germinates better AFTER being through the cow, cattle and pheasants,huns, and quail are sitting among the legs of cattle right now in a blizzard here, eating, safe between the overstory of the cattle to ward off winged prey, on trampled snow, digesting the excess corn, milo, weed seeds, and grass seeds, passed through the cattle. At night after an easy foraging day, they will stay as close as they can, in a hedgerow same as the cattle, using the cattle as an early warning system and their yarding area, and even their heat, of bunched, yarded up cattle to survive. Tip a hat to the cow! It takes wild theories of gamebird management, burning, reseeding, pruning cedars, and brush, that judicious grazing of cattle will solve! My granddad put cattle on timbered pasture, grazed it hard, had quail everywhere, we discontinued the winter grazing, no quail, resumed viola quail! Takes years of college education to come up with a solution to gamebird management with cattle. Interesting enough, the cattle actually make a living, rather than costing an arm and a leg to micro-manages game bird habitat.