—Lancaster Farming, Saturday, September 2, 1972
6
Waste Converted to Useable Products
Feedlot waste has been con
verted into usable products in a
two-step, laboratory frac
tionation process, USDA scientist
reported this week.
Dr. James H. Sloneker, of
USDA’s Agricultural Research
Service (ARS) described the
research at a symposium on
agricultural and municipal
wastes of the American Chemical
Society.
The studies were carried out by
Dr. Sloneker, Richard W. Jones,
Harold L. Griffin, Dr. Kenneth
Eskins, Bernard L. Burher and
Dr Geroge E. Inglett at ARS’s
Northern Regional Research
Laboratory, Peoria, 111.
Sloneker said the potential new
products developed by ARS in
clude:
—A feed fraction, comprising 43
percent of the waste, that com
pares with soybean meal in
protein content and amino acid
balance as determined in
analyses by ARS chemists.
—A residue fraction, 50 percent
of the waste, which contains
fibrous material. The chemists
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treated this fiber with resin and
pressed it into board. They used
the residue also as a nutrient for
a fungus that produces a fiber
digesting enzyme, then treated
chicken feed with the enzyme to
improve digestibility. The fungus
itself is almost half protein.
—A soluable fraction, 7 percent of
the waste, that was recombined
with the fiber in some fungus
growing experiments.
Cattle industry waste amounts
to more than a billion tons a year
in the United States. In some
areas, it has become a source of
pollution. If undigested plant
fiber can be removed from
manure or made more digestible,
refeeding manure might be
developed as a way to reduce this
source of pollution.
The ARS chemists estimate the
feed fraction is worth $2O a ton
more than the cost of recovery by
screening and filtering. They
found that filtering is the most
satisfactory of four second steps
tried in combination with the
coarse-screening, first step. The
feed-value estimate, $6O a ton, is
based on a standard of $lOO a ton
for 49 percent protein soybean
meal.
Amino acid composition of the
Elm
- LANDIS BROS. INC.
Lancaster
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feed fraction protein, determined
by analyses rather than feeding,
suggests the protein was
produced by microorganisms in
the animals’ digestive tracts. The
protein contains high levels of
lysine and methionine.
Microscopic examination of this
protein also suggests microbial
origin.
Analyses show that only 16.6
percent of the feed fraction
consists of carbohydrate and low
value cellulose and lignin, but
72.6 percent of the residue
fraction consists of these
materials. These bulky materials
require further processing if they
are to have value in feed or other
products.
Experimental board made
from the feedlot waste fiber alone
has neither the strength nor the
water resistance of commercial
hardboard. The fiber might be
used, however, with other waste
fiber and with oils to add strength
and water resistance.
The chemists found that either
the fibrous fraction or whole
feedlot waste can serve as
nutrient for growing the fungus,
Trichoderma viride. This fungus
uses carbohydrate, raising the
protein level in the fermentation
residue. It raises protein level
also simply by growing because
the fungal tissue contains about
47 percent of protein. This
protein, however, is low in
methionine, an essential amino
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ac i(j feed ate less, produced less
The fungus also produces a manure but gained as much
fiber-digesting enzyme. Baby weight as chicks eating control
chicks eating enzyme-treated feeds of two kinds.
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