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Title

Effect of the inclusion of quebracho tannins in a diet rich in linoleic acid on milk fatty acid composition in dairy ewes

AuthorsToral, Pablo G. ; Hervás, Gonzalo ; Belenguer, Álvaro ; Bichi, Elena ; Frutos, Pilar
KeywordsBiohydrogenation
Condensed tannin
Sheep
Trans fatty acid
Issue Date2013
PublisherAmerican Dairy Science Association
CitationJournal of Dairy Science 96: 431-439 (2013)
AbstractDespite controversy surrounding the ability of tannins to modulate the fatty acid (FA) profile of ruminantderived products, reports on this issue are still very limited for dairy sheep. This study was conducted to examine the effect of the inclusion of quebracho tannins in a diet rich in linoleic acid on ewe performance and milk FA composition. Thirty-six lactating ewes were distributed into 6 lots and allocated to 2 treatments (3 lots/treatment): control or quebracho. All sheep received a total mixed ration based on alfalfa hay and a concentrate (forage:concentrate ratio of 40:60) supplemented with 20 g of sunflower oil/kg of dry matter plus 0 (control diet) or 20 g of an extract of quebracho tannins/kg of dry matter (QUE diet). Milk production and composition were analyzed on d 0, 3, 6, 9, 12, 15, 18, 21, 24, and 27 on treatments, and milk FA profile on d 0, 3, 6, 12, 18, and 27. On d 27, samples of rumen fluid were collected for pH, and lactate, ammonia, and volatile FA concentration analysis. Feeding the QUE diet had no apparent effect on animal performance and hardly modified ruminal fermentation characteristics, except for a reduction in the molar proportions of minor volatile FA. Dietary tannins increased the milk concentration of several 18:1 and 18:2 isomers and decreased that of branched-chain FA. Some of these changes were relatively constant throughout the experiment (e.g., cis-12 18:1 and trans-9,cis-12 18:2), whereas others varied over time (e.g., trans-10 18:1, which increased gradually with the QUE diet). Significant differences between treatments in trans-11 18:1 and cis-9,trans-11 conjugated linoleic acid were only observed on d 3. Overall, addition of quebracho tannins to a diet rich in linoleic acid did not prove useful to beneficially modify milk FA composition, especially over the long term.
Description9 páginas, 4 tablas, 1 figura.
Publisher version (URL)http://dx.doi.org/10.3168/jds.2012-5622
URIhttp://hdl.handle.net/10261/63929
DOI10.3168/jds.2012-5622
ISSN0022-0302
Appears in Collections:(IGM) Artículos
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