Document Detail

Effect of endophyte type on carcass traits, meat quality, and fatty acid composition of beef cattle grazing tall fescue.
MedLine Citation:
PMID:  15644516     Owner:  NLM     Status:  MEDLINE    
Fourteen Hereford steers were used to compare carcass traits, meat quality, and fatty acid composition of beef from cattle grazing tall fescue infected with either wild-type (E+; n = 6) or novel, nil ergot alkaloid (AR542; n = 8) endophyte for 209 d. Average daily gain, live weight, and HCW were greater (P < 0.05) for AR542 cattle than for E+. No differences in LM color or pH were observed between AR542 and E+. Steaks from E+ cattle tended (P = 0.10) to have higher L* and b* than those from AR542 cattle at 0 d of display. Ground beef from E+ cattle also had higher (P < 0.05) L* than AR542 cattle, with no differences in a* or b* at 0 d of display. Color changes during display did not differ for both steaks and ground beef from E+ and AR542. Lipid oxidation levels increased (P < 0.05) during simulated retail display, but they did not differ between endophyte treatments. Adipose tissues from E+ cattle had a higher (P < 0.05) percentage of SFA, and a lower (P < 0.05) percentage of MUFA than adipose from AR542 cattle. Ground beef and i.m. fat had higher (P < 0.05) concentrations of SFA, MUFA, and cis-9, trans-11 isomer of conjugated linoleic acid, and lower (P < 0.05) concentrations of PUFA and PUFA:SFA ratio than s.c. fat. The n-6:n-3 fatty acid ratio did not differ among fat depots. Ergot-alkaloids were detected in s.c. adipose tissues, and alkaloid concentration was greater (P < 0.05) for E+ than AR542. Warner-Bratzler shear force values did not differ between endophyte types, but it decreased (P < 0.01) across the postmortem aging period. Conversely, sensory panel evaluation detected greater (P < 0.01) chewiness and lower (P < 0.05) juiciness for AR542 than for E+ steaks aged for 14 d. Although grazing cattle on tall fescue pastures infected with nil ergot alkaloid endophyte improved cattle performance, these results suggest that endophyte type has minor effects on carcass traits and meat quality of pasture-fed beef. Moreover, finishing cattle on tall fescue pastures showed the potential to enhance the fatty acid profile of beef from a human health perspective. Alkaloid concentration was greater (P < 0.05) in s.c. fat from E+ than AR542 (2.81 vs. 0.92 ppb; fresh-tissue basis). This is the first published report demonstrating the presence of alkaloids in beef tissues.
C E Realini; S K Duckett; N S Hill; C S Hoveland; B G Lyon; J R Sackmann; M H Gillis
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of animal science     Volume:  83     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-01-12     Completed Date:  2007-10-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  430-9     Citation Subset:  IM    
Animal and Dairy Science Department, University of Georgia, Athens 30602, USA.
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MeSH Terms
Adipose Tissue / chemistry,  drug effects
Body Composition / drug effects*,  physiology
Cattle / physiology*
Ergot Alkaloids / analysis,  pharmacology
Fatty Acids / analysis*
Festuca / metabolism,  microbiology*
Hydrogen-Ion Concentration / drug effects
Hypocreales / chemistry,  classification,  metabolism*
Least-Squares Analysis
Meat / standards*
Muscle, Skeletal / chemistry,  drug effects
Weight Gain / drug effects,  physiology
Reg. No./Substance:
0/Ergot Alkaloids; 0/Fatty Acids

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

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