Green winter wheat generally contains 18 to 26% protein and that 26% is at its highest in Feb. March and April and around 11% calcium and it also contains phosphorus and magnesium (natural laying mesh) both hens and roosters will eat it, but it is especially beneficial in its reproductive benefits to the hen pheasant in the spring time.
In addition to that in April, May and June wheat provides a green cushy place to hide a nest from many predators in an ocean of green. Just need to get the hatch out before its cut.
Wheat is a big time benefit to pheasants. If you "Google Earth" and look down at E. Colorado, W. & SW. Kansas,Texas and Oklahoma panhandles (the central & southern plains) the combination of wheat and center pivot irrigation may be the "Goose that Lays the Golden Egg" for wild pheasant production. But you also need a wet spring (not flooding spring) El nina winter and spring along with summer showers, for best results.