Few studies on feeding sprouted grain to beef. None, apparently, with corn sprouts. But some studies exist.
Beef Cattle Frame Scores:
"Limited information on the feeding value of sprouted feed grains is available. There is some energy lost during the germination process as heat, CO2, and moisture are produced. However, based on the animal feeding trials which have been conducted with sprouted grains, it does not appear that nutritive value of the grain is reduced or depressed. In some instances, it appears that sprouting may actually improve the feeding value of grain. Substantial sprouting will involve some reduction in energy available per kernel, with slight to moderate sprouting showing smaller effects on the feeding value of grains."