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Consider Non-toxic Fescue to Boost Beef Production Per Acre

Consider Non-toxic Fescue to Boost Beef Production Per Acre
University of Missouri beef nutritionist recommends starting over with a non-toxic fescue variety

Better grass, more cows, fewer acres. That's the right combination for beef producer profitability, says Justin Sexten, University of Missouri beef nutritionist

"How many of you think land taken out of grass for crops will return to grass?" Sexten asked at an Alliance for Grassland Renewal school held in Columbia, Mo. No beef producer held up a hand.

"Pasture land is expensive, or not available," Sexten said.

A main theme of the schools was to plant nontoxic novel-endophyte tall fescue to replace toxic Kentucky 31. Producers saw results of 14 research studies that show calves grazed on novel fescue gained 0.7 pounds more per day on average compared to calves on toxic K-31.

K31 fescue grazing can result in fescue foot, reproductive problems in cattle. (Photo: Howard F. Schwartz, Colorado State University)

"You can produce more beef on the land you own," Sexten said.

Eliminate fescue foot
Better gains are one of many benefits. During the cold winter, several producers learned the cost of losing cows to "fescue foot." One farmer lost nine cows out of a herd of 39.

"It's not only the lost cows, but also costs of replacement heifers," Sexten said.

Craig Roberts, MU Extension agronomist, described fescue foot as the most visible of losses from toxic fescue.

The toxin, produced by a fungus growing between cell walls of infected fescue, is a vasoconstrictor. It cuts blood flow to animal extremities. That causes feet, tails and ears to freeze. A cow can survive without an ear or tail, but not without a foot.

Related: Consider Reseeding to Eradicate Toxic Fescue

Toxin also affects an extremity on bulls, causing sterility. "When you see frost on a bull's scrotum, you have a problem," Sexten said.

The toxin can also prevent conceptions or cause abortions in pregnant cows. The toxin, ergovaline, resembles LSD and is similar to the toxin found in ergot, a fungus in seedheads of grasses and cereal grains.

Producers use the toxic grass because it requires little management. The toxin protects the grass from insects, leaf fungus, nematodes, droughts and overgrazing by cows.

The main reason farmers keep fescue is they don't see many of the losses, Roberts said. In introducing the program, he told producers there is an answer: "Renovate and reseed fescue with a new novel endophyte."

Emergence of a new variety
Years ago, MU plant breeders developed endophyte-free fescues. However, without pest defenses of toxic endophyte, the fescues did not persist under heavy grazing.

Plant breeders found other fungi, also endophytes, that protect fescue but don't poison cattle.

Endophyte in fescue is never seen by most farmers. The schools used a microscope to give views between fescue plant cells. Threadlike fungus is visible only under magnification.

Related: 16 Tips for Kentucky 31 Fescue Management

Endophyte fungi are found in nature. It happened that the one in the fescue variety that became K-31 was toxic.

"We have known alternatives for years. In extension we try to teach the hazards," Roberts said. "We had little success."

"With the Alliance we start over," he added. "We bring together everyone working on toxic fescue."  That includes MU, five seed companies, fescue testing labs, nonprofit groups, farmers, agribusinesses and USDA Natural Resources Conservation Service.

Mark Kennedy, retired grassland advisor with USDA, said keeping Missouri hills covered with grass prevents erosion. Some funds from FSA can be used to start grazing systems through the EQIP program.

Other groups are invited to join the eradication plan. Information is at

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