Document Detail

Odorant production and persistence of Escherichia coli in manure slurries from cattle fed zero, twenty, forty, or sixty percent wet distillers grains with solubles.
MedLine Citation:
PMID:  18676716     Owner:  NLM     Status:  MEDLINE    
Corn ethanol production removes starch and concentrates the remaining nutrients, including CP and minerals. When wet distillers grains with solubles (WDGS) are fed to cattle in place of corn, CP and minerals often exceed dietary needs. This may increase N emission, P run-off, and odor production. These variables are evaluated in this study. Crossbred steers (n = 160; 434 +/- 8 kg) were assigned in a completely randomized block design to 9 x 9 m pens with concrete floor (10 animals/pen; 4 pens/treatment). Steers were fed a finishing diet that contained 0, 20, 40, or 60% WDGS on a DM basis, and provided 13.3, 15.5, 20.6, or 24.9% CP, respectively. Two kilograms of manure slurry (14 to 23% DM) were collected from each pen monthly (Aug. 20, Sep. 24, and Oct. 22). Samples were analyzed immediately for odorants, DM, pH, NH(3), total alcohol, l-lactate, and concentrations of generic Escherichia coli. After incubation of the samples at 22 degrees C for 2, 4, 7, 10, 15, 21, and 28 d, samples were analyzed for methane production in addition to the above characteristics. Before incubation, NH(3), H(2)S, indole, phenol, isovalerate, isobutyrate, and acetate increased (P < 0.01) with increasing amounts of WDGS in the diet. Other odorants, including skatole, caproate, valerate, butyrate, and propionate, were greater (P < 0.01) in manure slurries from cattle fed 20 or 40% WDGS, compared to 0% WDGS. The l-lactate was greater (P < 0.01) in slurries from cattle fed 0% WDGS (447 mu mol/g of DM) compared with the other treatment slurries (14 to 15 mu mol/g of DM). After incubation, l-lactate contributed to lowered slurry pH (6.3, 7.1, 7.6, and 8.2, respectively, for 0, 20, 40, and 60% WDGS), which inhibited microbial fermentation, E. coli persistence, and methane production. Because of the favorable, more neutral pH in the 40 and 60% WDGS slurries, many of the odorant compounds were rapidly converted to methane during a 28-d static incubation. Escherichia coli O157:H7 inoculated into subsamples of the manure slurries exhibited behavior similar to that of naturally present generic E. coli, surviving in greater numbers longer (P < 0.05) in 20 and 40% WDGS slurries than in 0% WDGS. These data indicate feeding WDGS can increase odorants in manure slurries and extend the persistence of E. coli.
V H Varel; J E Wells; E D Berry; M J Spiehs; D N Miller; C L Ferrell; S D Shackelford; M Koohmaraie
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Publication Detail:
Type:  Journal Article     Date:  2008-08-01
Journal Detail:
Title:  Journal of animal science     Volume:  86     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-11-27     Completed Date:  2009-01-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3617-27     Citation Subset:  IM    
USDA-ARS, US Meat Animal Research Center, Clay Center, NE 68933, USA.
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MeSH Terms
Animal Feed*
Animal Nutritional Physiological Phenomena*
Colony Count, Microbial
Diet / veterinary
Escherichia coli / isolation & purification,  physiology*
Fatty Acids, Volatile / analysis
Manure / analysis,  microbiology*
Reg. No./Substance:
0/Fatty Acids, Volatile; 0/Manure

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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