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Duodenal flow and biohydrogenation of C18 polyunsaturated fatty acids in beef steers fed high sugar grass, red clover or grass/red clover mix silages

Published online by Cambridge University Press:  20 November 2017

M.R.F. Lee ,
J.K.S. Tweed ,
P.L. Connelly ,
R.J. Merry ,
R.J. Dewhurst  and
N. D. Scollan
M.R.F. Lee
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, UK
J.K.S. Tweed
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, UK
P.L. Connelly
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, UK
R.J. Merry
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, UK
R.J. Dewhurst
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, UK
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Extract

Forage lipids contain a high proportion of the polyunsaturated fatty acids (PUFA) C18:2n-6 and C18:3n-3. However, microbial biohydrogenation in the rumen results in extensive loss of these beneficial fatty acids. This experiment investigated the duodenal flow of fatty acids in beef steers offered grass or red clover silage, the latter of which has been shown to reduce biohydrogenation of C18:3n-3 (Lee et al. 2003a). In addition the effect of silage prepared from a ryegrass with high water soluble carbohydrate (WSC) content was investigated, as previous research (Lee et al. 2003b) has shown that increasing the availability of WSC lowered rumen pH and increased the proportion of propionate, relative to other volatile fatty acids, conditions which have been linked to reduced biohydrogenation (Jenkins, 1993).

Type
Theatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2004 , 2004 , pp. 66
Copyright
Copyright © The British Society of Animal Science 2004

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References

Jenkin, TC, 1993. Lipid metabolism in the rumen. J. Dairy Sci. 76: 3851–3863 CrossRefGoogle Scholar
Lee, MRF, Harris, LJ, Dewhurst, RJ, Merry, RJ, Scollan, ND. 2003a. The effect of clover silageson long chain fatty acid rumen transformations and digestion in beef steers. Ani. Sci. 76: 491–501.CrossRefGoogle Scholar
Lee, MRF, Merry, RJ, Davies, DR, Moorby, JM, Humphreys, MO, Theodorou, MK, MacRae, JC, Scollan, ND 2003b. Effects of increasing availability of water-soluble carbohydrates on in vitro fermentation. Ani. Feed Sci. Technol. 104: 59–70.CrossRefGoogle Scholar
Lee, MRF, Tweed, JKS, Connelly, PL, Merry, RJ, Dewhurst, RJ, Scollan, ND. 2004. Duodenal flow of C18:1 and conjugated linoleic acid isomers in beef steers fed high sugar grass, red clover or grass/red clover mix silages. Pro. Bri. Soc. Ani. Sci. (In this meeting).Google Scholar