Kansas State University. Agricultural Experiment Station and Cooperative Extension Service
Doi
Abstract
Seventy two individually fed Angus × Hereford
steers (642 lb) were used to evaluate the
effects of supplementing limit-fed, growing diets
with either soybean meal (SBM) or nonenzymatically
browned soybean meal (NSBM).
Eight steers were allotted to a control diet
composed of 39.1% high-moisture corn, 42%
cottonseed hulls, 10.4% ground corn, 5% cane
molasses 2.25% urea, and 1.5% vitamins and
minerals (dry basis). The remaining steers were
allotted to diets that derived 100, 80, 60, or
40% of their supplemental protein from SBM or
60, 45, 30, or 15% of their supplemental protein
from NSBN. The balance of supplemental
protein came from urea. All diets were formulated
to contain 13.0% crude protein (dry
basis). Steers were fed once daily for 80 days
at 2.25% of BW. Average daily gain and
efficiency did not differ (P>.05) between
sources (ADG=1.932 + .103 × (% CP from
SBM) + .097 × (% CP from NSBM);
gain:feed=.140 + .0058 × (% CP from SBM) +
.0051 × (% CP from NSBM)). The lack of
response to NBSBM supplementation above
that for SBM suggests that either degradable
intake protein was limiting in the basal diet or a
large proportion of the amino acids in the
NSBM were unavailable due to overprocessing