Biohydrogenation and digestion of long chain fatty acids in steers fed on different sources of lipid

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dc.contributor.author Dhanoa, M. S.
dc.contributor.author Scollan, Nigel D.
dc.contributor.author Maeng, W. J.
dc.contributor.author Choi, Nag-Jin
dc.contributor.author Wood, J. D.
dc.contributor.author Enser, Mike
dc.date.accessioned 2009-10-28T12:50:23Z
dc.date.available 2009-10-28T12:50:23Z
dc.date.issued 2009-10-28
dc.identifier.citation Dhanoa , M S , Scollan , N D , Maeng , W J , Choi , N-J , Wood , J D & Enser , M 2009 , ' Biohydrogenation and digestion of long chain fatty acids in steers fed on different sources of lipid ' breeding perennial clovers for temperate agriculture: centenary review. Journal of Agricultural Science , pp. 345-355 . en
dc.identifier.issn 0021-8596
dc.identifier.other PURE: 135122
dc.identifier.other dspace: 2160/3353
dc.identifier.uri http://hdl.handle.net/2160/3353
dc.description Scollan, N. D., Dhanoa, M. S., Choi, N.-J., Maeng, W. J., Enser, M., Wood, J. D. (2001). Biohydrogenation and digestion of long chain fatty acids in steers fed on different sources of lipid.   Journal of Agricultural Science, 136, (3), 345-355 en
dc.description.abstract Rumen biohydrogenation of dietary polyunsaturated fatty acids (PUFA) is a significant limitation on any attempt to manipulate the PUFA content of ruminant products (meat or milk). This study examined rumen biohydrogenation of PUFA, the effects of PUFA on other aspects of rumen metabolism and fatty acid flow to and digestion in the small intestine of steers fed on different sources of lipid. Animals were fed ad libitum on grass silage and one of four concentrates (60:40 forage:concentrate on a dry matter basis) containing differing sources of lipid: megalac (rich in C16:0; M), linseed (rich in C18:3n-3; L), fish oil (rich in C20:5n-3 and C22:6n-3; FO) and a mixture of linseed/fish oil (LFO). Diets were formulated so that total dietary oil intake was approximately 60 g/kg of the DM intake, approximately half of which was from the experimental test oil. Rumen NH3-N (P = 0·09) and total VFA concentrations (P = 0·007) were higher on L, FO and LFO compared to M. Dry matter intakes did not differ across treatments and averaged 7·2 kg/day. Intake and flow of fatty acids to the duodenum was 323, 438, 344 and 381 (S.E.M. 9·1; P <0·001) and 432, 489, 412 and 465 (S.E.M. 18·5; P <0·1) g/day for M, L, FO and LFO, respectively. Biohydrogenation of C18:1n-9 was lower than all the other unsaturated fatty acids and it was lower of FO and LFO compared to M and L, on average 66·1 and 72·2 %, respectively. Biohydrogenation of C18:2n-6 averaged 89·8 % across treatments and was lower (P <0·05) on M compared to L and FO. Biohydrogenation of C18:3n-3 averaged 92·1 % across treatments and was lowest on M (88·8 %) and highest on L and LFO (94·3 %). Biohydrogenation of C20:5n-3 and C22:6n-3 averaged approximately 91 and 89 % across the treatments, respectively. Small intestinal digestibilities of all fatty acids were high. In conclusion, feeding different sources of lipid with different fatty acid composition had significant effects on rumen function. The PUFA in whole linseed were only partially protected from biohydrogenation by the seed coat and in contrast to previous reports the C20 PUFA in fish oil were biohydrogenated to a large extent. en
dc.format.extent 11 en
dc.language.iso eng
dc.relation.ispartof breeding perennial clovers for temperate agriculture: centenary review. Journal of Agricultural Science en
dc.title Biohydrogenation and digestion of long chain fatty acids in steers fed on different sources of lipid en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


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