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Rumen fatty acid metabolism in lambs fed silages containing bioactive forage legumes

AuthorsToral, Pablo G. ; Campidonico, Lucca; Copani, G.; Hervás, Gonzalo ; Luciano, G.; Ginane, Cecile; Priolo, Alessandro; Frutos, Pilar ; Niderkorn, Vincent
Issue Date2015
PublisherEuropean Association for Animal Production
Citation66th Annual Meeting of the European Federation of Animal Science (EAAP). Innovation in livestock production: from ideas to practice: 380 (2015)
AbstractInclusion of forage legumes, such as red clover (RC) or sainfoin (SF), in grass silage might affect rumen lipid metabolism. Polyphenol oxidase in RC is known to alter lipolysis, and tannins in SF modify biohydrogenation, which may subsequently modulate the fatty acid (FA) profile of ruminant-derived products. To compare the effects of these fodder legumes on rumen FA composition, 40 lambs (initial body weight: 31±0.3 kg) were allocated to 5 experimental groups (n=8) and fed ad libitum one of the following five silages: timothy grass (T, control, without bioactive components), T+SF (1:1), T+RC (1:1), T+SF+RC (2:1:1), or SF+RC (1:1). Forages were mixed on a DM basis. In addition to the silages, animals received daily a restricted amount of barley and straw. After 10 weeks on treatments, lambs were slaughtered and rumen digesta samples were collected for FA determinations by gas chromatography. Data were analyzed by 1-way ANOVA. Replacement of T with forage legumes was associated with greater rumen concentrations of polyunsaturated FA and lower of monounsaturated FA (P<0.05), mainly due to changes in 18:3n-3 and t11-18:1, respectively. However, the concentrations of other bioactive FA, such as c9-18:1, t10-18:1, c9t11-18:2, and t10c12-18:2, were not affected by diet (P>0.10). Only subtle variations between the effects of RC and SF would suggest that both forage legumes are able to similarly decrease the extent of ruminal FA metabolism, without altering its major pathways, while greater responses to SF+RC might indicate cumulative effects. The fact that RC and SF differently affected rumen odd- and branched-chain FA, which are commonly used as microbial markers, would most probably be related to the ruminal mechanisms underlying the response to each fodder legume.
DescriptionTrabajo presentado a la : 66th Annual Meeting of the European Federation of Animal Science (EAAP). Innovation in livestock production: from ideas to practice. (Varsovia (Polonia), 31 de agosto a 4 de septiembre de 2015).
Publisher version (URL)https://eaap2015.syskonf.pl/
Appears in Collections:(IGM) Comunicaciones congresos
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