Show simple item record Shingfield, K J Saebø, A Saebø, P-C Toivonen, V Griinari, J M 2013-11-14T22:02:25Z 2013-11-14T22:02:25Z 2009-09
dc.identifier.citation Shingfield , K J , Saebø , A , Saebø , P-C , Toivonen , V & Griinari , J M 2009 , ' Effect of abomasal infusions of a mixture of octadecenoic acids on milk fat synthesis in lactating cows ' Journal of Dairy Science , vol 92 , no. 9 , pp. 4317-4329 . DOI: 10.3168/jds.2008-2002 en
dc.identifier.issn 0022-0302
dc.identifier.other PURE: 3536615
dc.identifier.other PURE UUID: 7be62328-a9ea-415a-b46d-d918b3375dcd
dc.identifier.other PubMed: 19700691
dc.identifier.other Scopus: 70349272738
dc.identifier.other 2160/12576
dc.description.abstract Diets causing milk fat depression (MFD) are known to alter ruminal lipid metabolism leading to the formation of specific biohydrogenation intermediates that exert antilipogenic effects. Several isomers of conjugated linoleic acid (CLA), namely trans-10, cis-12 CLA, cis-10, trans-12 CLA, and trans-9, cis-11 CLA, inhibit mammary lipogenesis in the lactating cow, but ruminal outflow of these biohydrogenation intermediates does not account entirely for the reductions in milk fat synthesis during diet-induced MFD. Milk fat trans-10 18:1 concentrations are consistently increased on diets that cause MFD, suggesting a possible role in the regulation of milk fat secretion. Three rumen-fistulated cows in mid lactation were used in a 3 x 3 Latin square to evaluate the effects of a mixture of 18:1 fatty acid methyl esters (FAME) on milk fat synthesis. Experimental treatments consisted of abomasal infusions of ethanol (control), 6 g/d of trans-10, cis-12 CLA (positive control; CLA), or 247 g/d of a mixture of 18:1 FAME containing (% fatty acids) cis-9 (9.45), cis-12 (3.35), trans-10 (37.3), trans-11 (37.4), and trans-12 (2.66) as major isomers (T181 treatment). Administration of the T181 treatment supplied 92.1 g/d of trans-10 18:1. Infusions were conducted over a 5-d period with a 9-d interval between treatments. Treatments had no effect on dry matter intake, milk yield, or milk protein. Relative to the control, abomasal infusion of T181 and trans-10, cis-12 CLA treatments reduced milk fat secretion by 19.5 and 41.5%, respectively. Even though a direct cause and effect on mammary lipogenesis could not be established, comparisons with published data and considerations of the relative abundance of constituent FAME in treatment T181 implicated trans-10 18:1 as the isomer responsible. In conclusion, current data suggest that trans-10 18:1 potentially exerts antilipogenic effects and may contribute to the reduction in milk fat synthesis during diet-induced MFD in the lactating cow. en
dc.format.extent 13 en
dc.language.iso eng
dc.relation.ispartof Journal of Dairy Science en
dc.rights en
dc.subject Abomasum en
dc.subject Animals en
dc.subject Cattle en
dc.subject Diet en
dc.subject Dietary Supplements en
dc.subject Eating en
dc.subject Fats en
dc.subject Female en
dc.subject Lactation en
dc.subject Milk en
dc.subject Milk Proteins en
dc.subject Oleic Acids en
dc.title Effect of abomasal infusions of a mixture of octadecenoic acids on milk fat synthesis in lactating cows en
dc.type /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article en
dc.contributor.institution Department of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en

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