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Feeding high-moisture corn instead of dry-rolled corn reduces odorous compound production in manure of finishing beef cattle without decreasing performance

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We hypothesized that feeding steers ground high-moisture ensiled corn (HMC) in lieu of dry-rolled corn (DRC) would reduce the amount of starch being excreted in the manure and the associated odorous compound production. One hundred forty-eight crossbred steers (363 ± 33 kg of BW) were fed a DRC-or HMC-based diet in a feeding trial, and 8 Charolais-sired steers (447 ± 22 kg of BW) were used in a nutrient balance study. Steers fed HMC tended to have a slightly lower DMI (P = 0.09), ADG (P = 0.06), and yield grade, but G:F, final HCW, and quality grade did not differ (P >= 0.23) between treatments. Compared with feeding DRC, feeding HMC decreased (P = 0.02) starch intake from 5,407 to 4,846 g/d, decreased (P < 0.01) fecal excretion of starch from 448 to 292 g/d, and increased (P = 0.03) starch digestibility from 91.7 to 94.1%. Nitrogen intake was greater (P < 0.01) for steers fed DRC than HMC in both studies, but N retention did not differ (P = 0.55). Heat production and energy retention did not differ between the 2 treatments (P >= 0.55). In manure slurries incubated for 35 d with soil and water, total VFA concentration was lower (P < 0.01) in manure from steers fed HMC (1,625 μmol/g of DM) compared with steers fed DRC (3,041 μmol/g of DM). Lower initial (d 0) starch concentrations and greater initial pH was also observed in the slurries from the HMC manure. By d 3 of slurry incubation, there was an increase (P < 0.01) in free glucose and L-lactic acid in the DRC slurries but not in the HMC slurries. During manure incubation, alcohol and VFA content increased (P < 0.01) and pH declined, but to a lesser extent (P < 0.01) in the HMC slurries. However, branched-chain VFA increased more (P < 0.01) in the HMC slurries than in the DRC slurries. These data suggest that feeding HMC instead of DRC decreased fecal starch and production of some potentially odorous compounds in a finishing cattle system but had little impact on animal productivity.
Archibeque, S.L. , Miller, D.N. , Freetly, H.C. , Ferrell, C.L.
beef cattle , finishing , cattle feeding , steers , corn silage , feed processing , moisture content , cattle manure , odor control , odor emissions , corn starch , corn , crossbreds , nitrogen balance , Charolais , balance studies , digestibility , thermic effect of food , energy balance , volatile fatty acids , animal manure management , pH , glucose , lactic acid
p. 1767-1777.
Includes references
Journal of animal science 2006 July, v. 84, no. 7
American Society of Animal Science
Journal Articles, USDA Authors, Peer-Reviewed
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