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Utilizing Corn Stalks for Cow Feed a No-Brainer
USAgNet - 09/12/2018

For cattle producers, crop residues can be a viable and inexpensive grazing option. University of Illinois Extension beef cattle specialist Travis Meteer explains what producers need to know.

"Cattle graze selectively, looking for the more palatable feedstuffs," Meteer says. "The more palatable parts of the plant are also more nutritious. Cattle first eat the remaining corn grain, then the husks, leaves, and finally the stalk."

Because cattle eat the more digestible and higher protein portions first, a good mineral may be the only supplementation needed for the first month. The exception is a herd that includes fall-calving cows or stocker calves. For them, Meteer says, a supplement will be necessary to meet nutrient demands of lactation and growth, respectively.

Using an equation developed at the University of Nebraska, a field that averages 200 bushels per acre yields 2,832 pounds of leaf and husk. Only 50 percent of the 2,832 pounds is available for the animal; the rest is trampled or lost in weathering. Thus, 1,416 pounds of dry matter (DM) husk and leaf per acre are available as feed.

A 1,300-pound cow consumes 884 pounds of DM per month. At 200 bushels an acre, approximately two-thirds of an acre of cornstalks is needed to feed a single cow for 30 days. To feed the same cow on cornstalks for 60 days, 1.3 acres would be needed.

"Producers should scout fields for ear drop or down corn areas, as a significant amount of grain loss in fields can cause acidosis or founder in animals. Fields with these areas will need careful management via strip grazing or completely fencing the problem areas out," he says.

Advances in portable electric fencing technology can be used when grazing cornstalks. Strip grazing can be easily achieved with geared reels, step-in posts, and a solar fence charger. While strip grazing has showed to increase the utilization of cornstalks, Meteer says it is important to be timely with moves. Paying attention to cow behavior will be the simplest way of knowing when to move the fence. Rain and wet weather can increase trampling and require quicker moves.

However, Meteer says that some technology may work against farmers "Many newer combines are equipped with mowers on the head to reduce residue build up. If you plan to graze the cornstalks, it is recommended to turn the mowers off," he explains. "Mowing reduces particle size and speeds up degradation of the cornstalk. Mowed residue will break down faster; therefore, less will be available for animals after a few weeks."

Extreme weather conditions during the growing season are worth reflecting on, according to Meteer. Dry conditions can create accumulation of nitrates in the lower stalk. Fortunately, cattle will eat the stalk portion of the plant last. As a result, concern of nitrate poisoning is low when grazing. "Best practice in this scenario is to ensure cows are not forced to eat the stalk. If baling cornstalks for feed, a nitrate test is recommended," he adds.

Foliar diseases were a challenge in many corn fields this year. Plant tissues that are affected by disease will break down more rapidly too. Meteer recommends looking to healthy fields for the best cornstalk grazing or baling.

If cornstalks can't be grazed, they can be baled. Baling cornstalks will add costs to the feed in the form of fuel, labor, equipment costs, and fertilizer replacement costs. Even with these costs, Meteer says cornstalks can still be an economical feed. Hauling manure back to the harvested fields will displace some fertilizer costs associated with cornstalk removal.

"Generally, fertilizer value of a 1,200-pound round bale of cornstalks is around $12. Remember, harvesting costs such as fuel, labor, transportation, and equipment wear are all real costs to evaluate," he says.

Meteer also notes fewer wheat acres in some areas of the country translate to a shorter supply of straw with current prices being strong. Therefore, baling cornstalks for bedding will be more cost-effective than buying straw.

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