In the News -
December 2007
Dietary sulfur concerns with commodity diets
LITTLE ROCK - With skyrocketing corn prices, cattle producers are scrambling
to find ways to cut corners on feed.
"One practice gaining interest is using byproducts of wet and dry corn
milling to take place of more expensive corn- and protein meal-based growing
cattle diets in the South," said Dr. Shane Gadberry, assistant
professor/livestock specialist with the University of Arkansas Cooperative
Extension Service.
While it's an acceptable practice, he warned producers to be aware of the
dangers from sulfur in these products, which can cause polioencephalomalacia
(PEM).
"Producers feeding high-concentrate diets to growing cattle should use
precaution with diets that lead to excess sulfur intake," Gadberry warned.
Cattle producers developing 400- to 800-pound calves on higher concentrate
diets that include these byproducts should keep a tally of sulfur amount to
avoid PEM, Gadberry advised.
Polioencephalomalacia is a neurological disorder that causes blindness, loss
of coordination, arched back with head thrown back and seizures.
The maximum tolerable concentration of dietary sulfur, reported by the
National Research Council, is estimated at 0.40 percent of the diet.
Gadberry said the online feed composition library maintained by DairyOne.com
lists feeds that can lead to excessive dietary sulfur, including molasses,
distillers' solubles, corn steep liquor, corn gluten feed and distillers'
grains. The web site provides a table with concentrations.
These feeds can vary considerably in sulfur content, Gadberry said. Because
of this variability, producers who intend to include them alone or in
combination at levels greater than 40 percent of dietary dry matter should
consider testing feeds for sulfur content.
"When you're tallying sulfur intake from feeds, be sure to factor in sulfur
amounts in water in areas where high sulfur in water is a problem," Gadberry
said.
Cattle that exhibit PEM can be treated with injectable thiamine. Numerous
Arkansas producers routinely add thiamine to cattle diets, but there has been no
proven benefit from this practice, according to Gadberry.
He said research at Colorado State University by Ricardo Sager and co-workers
in 1990 found that thiamine content in rumen fluid and plasma didn't diminish
with experimentally induced PEM.
"This suggests managing sulfur intake should be first order for preventing
PEM," Gadberry said. "You should contact your county extension office for
assistance with nutrient requirements for beef cattle and feedstuff analysis."
The Cooperative Extension Service is part of the U of A Division of
Agriculture.
December 7, 2007
Media Contact: Lamar James
Extension Communications Specialist
U of A Division of Agriculture
Cooperative Extension Service
(501) 671-2187 or (501) 753-0207
ljames@uaex.edu
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