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Abstract
Forty-eight crossbred steer calves (initial BW = 272 kg) blocked by BW were randomly
assigned to eight pens and were fed either a 12.9% CP high concentrate diet with 15%
corn silage (CS), 0.51% urea, and 0.30% P or a 13.4% CP high concentrate diet with
45 to 50% corn gluten feed (CG) and 0.60% P for the growing-finishing period to compare
growth performance and carcass traits and to determine nutrient excretion. Steers
were housed in outside pens with shelter and constant access to water. Steer BW were
taken at the initiation, at 28-d intervals, and at the completion of the 186-d trial.
Steers were harvested at approximately 540 kg, and carcass data were collected after
a 24-h chill. Manure was collected and sampled from each pen for a 3-d period (d 146
to 148 of the trial) and pooled by treatment for analysis. Overall, CG-fed steers
tended (P=0.11) to have higher daily gain. Dry matter intake was greater (P<0.05)
for steers fed the CG diet during the last 56 d of the trial, which contributed to
a poorer (P<0.05) feed conversion during this period. Fat thickness; percentage of
kidney, pelvic, and heart fat (%KPH); and longissimus area (REA) were not different between treatments. Manure total N was not affected by dietary
treatment, and total P excretion was 85% greater (P<0.05) when steers were fed the
CG diet compared with the CS diet. Water-soluble P and organic P were also greater
(P<0.05) for steers fed the CG treatment compared with the CS treatment. Manure ammonium
N was 42% greater (P<0.05) from the CG treatment when compared with the CS treatment.
Feedlot diets supplemented with CG dramatically exceed P requirements and can lead
to P accumulation in manure, which must be carefully managed to minimize an adverse
impact on the environment.
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© 2005 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
