Cattle can graze corn stalks and make good use of them, but the safe way is to control access, watch for leftover grain, and supplement what the residue lacks. Done right, cornstalk grazing extends your grazing season and cuts hay costs. Done carelessly, it can cause acidosis or nitrate poisoning.
What cattle eat first
Cattle pick the best material first: any dropped ears and loose kernels, then husks and leaves, and only last the coarse stalks. As the field is grazed, quality drops. That is why protein is highest in the first weeks, and why cows left on a field too long lose weight.
Biggest risks
- Acidosis from grain: ears knocked down by wind or the combine can hold a lot of grain. If hungry cattle eat too much at once, rumen pH crashes, and cattle can get sick or die. Scout the field before turning cattle in, and pick up or fence off heavy grain areas.
- Nitrates: drought-stressed or stunted corn can store nitrates in the lower stalk. If you’re grazing standing green corn, have it tested and introduce cattle gradually.
- Foreign objects: old wire, bolts, and other trash in fields can injure cattle.
- Moldy residue and ears: avoid any moldy corn.
Grazing method
- Walk the field and note downed corn, weeds, and any hazards.
- Fill cattle on hay or pasture before turning them out so they don’t gorge.
- Use temporary fencing to strip-graze, giving a few days of feed at a time. This limits waste and keeps cattle from rooting out grain.
- Provide clean water and a free-choice mineral.
- Move cattle out before they start losing condition, and supplement protein for later grazing.
How it fits the herd
Cornstalks are best for mature dry cows in good body condition, which have the lowest nutrient needs. Lactating cows, growing calves, and thin animals generally need more than residue can offer. See ground ear corn for cattle if you’re feeding corn grain, and how much corn silage to feed a dairy cow if you’re using chopped corn.
Bottom Line
Cornstalk grazing is cheap forage when you scout for grain, watch nitrates, limit access, and add protein and minerals. Talk with your veterinarian or extension agent before turning cattle onto a field you’re unsure about. This is general information, not veterinary advice.
