Grazing corn worked quite well for us, but if much is planted, it needs to be staggered in planting times to keep the quality consistent. If it was grazed when the plant was just tasseling and shooting ears, the cows cleaned it up very well, with very little wastage and good milk production. However, when the maturity advanced another 2-3 weeks, production dropped and wastage increased. Sorghum-Sudan grass has excellent potential for good grazing and milk production, but in a dry year, if possible, it should be planted on soils that are not as droughty because prussic acid poisoning is possible on wilted, stressed plants. This will force you to hay the crop to salvage it.
Pearl millet has good forage quality, if grazed before it is too mature.
Its growth and maturity are a little different than sorghum-sudan grass, but if too mature quality drops very quickly. Japanese millet and the Red River crabgrass were mixed in the drill and sown together. The Japanese millet can be grazed a little earlier than the pearl millet. The turnips were seeded in June, but due to a small seed and subsequent need for shallow planting and dry soils, the stand was mediocre. We saved the turnips for September and October grazing, while stockpiling perennial pastures.