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Duodenal flow and biohydrogenation of C18 polyunsaturated fatty acids in beef steers fed isonitrogenous and isoenergetic diets with contrasting forage: concentrate ratios

Published online by Cambridge University Press:  23 November 2017

M.R.F. Lee ,
J.K.S. Tweed  and
N. D. Scollan
M.R.F. Lee*
Affiliation:
Inst. of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, U.K.
J.K.S. Tweed
Affiliation:
Inst. of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, U.K.
N. D. Scollan
Affiliation:
Inst. of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, U.K.
*
Email: michael.lee@bbsrc.ac.uk
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Extract

Data on ruminal metabolism of lipids from forages have shown extensive biohydrogenation of C18 polyunsaturated fatty acids (Lee et al. 2003). Recent studies have noted a reduction in biohydrogenation an increase in duodenal flow of C18:1 trans- 11 and a shift in the ruminal production of CLA from cis- 9 trans- 11 CLA towards trans- 10 cis- 12 CLA with increasing amounts of concentrate in the diet (Kucuk et al. 2001, Loor et al. 2004). The study assessed the effect of feeding steers on isonitrogenous and isolipid diets differing in forage concentration and supplemented with linseed oil on ruminal lipid metabolism.

Type
Theatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2005 , 2005 , pp. 71
Copyright
Copyright © The British Society of Animal Science 2005

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References

Kucuk, O., Hess, B.W., Ludden, P.A. and Rule, D.C. 2001. Effect of forage: concentrate ratio on ruminal digestion and duodenal flow of fatty acids in ewes. Journal of Animal Science 79: 2233–2240.CrossRefGoogle ScholarPubMed
Lee, MRF, Harris, LJ, Dewhurst, RJ, Merry, RJ, Scollan, ND. 2003. The effect of clover silages on long chain fatty acid rumen transformations and digestion in beef steers. Ani. Sci. 76: 491–501.CrossRefGoogle Scholar
Loor, J.J., Ueda, K., Ferlay, A., Chilliard, Y. and Doreau, M. 2004. Biohydrogenation, duodenal flow, and intestinal digestibility of trans fatty acids and conjugated linoleic acids in response to dietary forage: concentrate ratio and linseed oil in dairy cows. Journal of Dairy Science 87: 2472–2485.CrossRefGoogle ScholarPubMed