The greatest concern for cows that are allowed to graze drought-damaged corn fields is nitrates. The nitrates are usually concentrated in the first 8 inches of the stalk. So if cows are allowed to graze these stalks, don't force them to eat the bottom part of the stalk. Cows will select the leaves, ears, and upper part of the stalk first. Usually, cows will only eat the lower part of the stalk when they have nothing left to eat. That means that you cannot overstock or over-graze the field. Remove cows from the field before they have been forced to eat the lower stalk. In addition, fill cows up with hay before they are turned out on the field for the first time.
Whether there are ears needs to be considered also. If there are greater than 6 to 7 bushels per acre available, a fence needs to be constructed to limit the amount the cows can eat.
