Document Detail

Effect of diets containing linoleic acid- or oleic acid-rich oils on ruminal fermentation and nutrient digestibility, and performance and fatty acid composition of adipose and muscle tissues of finishing cattle.
MedLine Citation:
PMID:  15890808     Owner:  NLM     Status:  MEDLINE    
Two trials were conducted to determine the effect of linoleic acid- or oleic acid-rich safflower oil on ruminal fermentation, nutrient digestion, feedlot performance, carcass characteristics, and fatty acid composition of adipose and muscle tissues of beef cattle. In both trials, cattle were fed a finishing diet based on barley grain, wheat silage, and alfalfa hay. Oils were fed at 5% of dietary DM. In a metabolism trial, four ruminally and duodenally cannulated Angus crossbred steers were subjected to linoleic acid-rich oil or oleic acid-rich oil in a crossover design with covariate periods (no oil supplementation). In a finishing trial, 16 individually fed Angus crossbred steers and heifers (eight per diet) received linoleic acid- or oleic acid-rich oils during the last 86 d of a 116-d feeding period. Ruminal pH, ammonia concentration, protozoal counts, major VFA concentrations, acetate-to-propionate ratio, polysaccharide-degrading activities, microbial N flow to the duodenum, and the efficiency of microbial N synthesis in the rumen were not affected (P = 0.18 to 0.96) by type of oil. Type of oil had no effect on total-tract apparent digestion of nutrients (P = 0.46 to 0.98). Ruminal true nutrient digestibilities did not differ between oils (P = 0.15 to 0.99), except that the linoleic acid-rich oil decreased (P = 0.05) NDF digestibility. Dry matter intake, ADG, G:F, and carcass characteristics did not differ (P = 0.11 to 0.84) between the two oils. Overall, the difference in dietary fatty acids provided to the cattle produced few changes in tissue fatty acids. Weight percentages of c9t11 CLA were unaltered by the addition of linoleic acid to the diet compared with oleic acid, probably as a result of low vaccenic acid production in the rumen, as the pathway of biohydrogenation was apparently primarily through the t10 pathway.
A N Hristov; L R Kennington; M A McGuire; C W Hunt
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of animal science     Volume:  83     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-05-13     Completed Date:  2007-08-09     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1312-21     Citation Subset:  IM    
Department of Animal and Veterinary Science, University of Idaho, Moscow, 83844-2330, USA.
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MeSH Terms
Adipose Tissue / chemistry,  drug effects
Animal Nutritional Physiological Phenomena
Cattle / metabolism*
Cross-Over Studies
Diet / veterinary*
Dietary Fats, Unsaturated / administration & dosage,  analysis,  pharmacology*
Digestion / drug effects*
Fatty Acids / analysis
Fermentation / drug effects
Linoleic Acid / administration & dosage,  analysis,  pharmacology
Meat / standards
Muscles / chemistry,  drug effects
Oleic Acid / administration & dosage,  pharmacology
Rumen / drug effects*,  metabolism
Safflower Oil / administration & dosage,  chemistry
Reg. No./Substance:
0/Dietary Fats, Unsaturated; 0/Fatty Acids; 112-80-1/Oleic Acid; 2197-37-7/Linoleic Acid; 8001-23-8/Safflower Oil

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

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