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Diet supplementation with 18:0 does not alleviate fish oil-induced milk fat depression in dairy ewes

AutorToral, Pablo G. ; Hervás, Gonzalo ; Carreño, David ; González, Jesús Salvador ; Amor, Javier; Frutos, Pilar
Fecha de publicación2015
EditorEuropean Association for Animal Production
Citación66th Annual Meeting of the European Federation of Animal Science (EAAP). Innovation in livestock production: from ideas to practice: 474 (2015)
ResumenThe supplementation of ewe diet with fish oil (FO) may improve the fatty acid (FA) profile of milk but induces milk fat depression (MFD). This latter effect has been associated with a shortage of 18:0 for mammary cis-9 18:1 endogenous synthesis and its possible impact on the maintenance of milk fat fluidity. On this basis, this study was conducted to test the hypothesis that supplemental 18:0 would alleviate FO-induced MFD in sheep. The assay followed a 3×3 Latin square design (4 animals/group) with 3 periods of 4 weeks each and 3 experimental diets: non-supplemented (control), and supplemented with 2% FO (FO) or with 2% FO plus 2% 18:0 (FOSA). Diets were offered ad libitum, and milk production and composition (including a complete FA profile) were analyzed on the last 3 days of each period. At the end of the trial, the digestibility of additional 18:0 was estimated using 6 lactating sheep. Milk yield was not affected by the inclusion of fish oil in the diet (P>0.10), despite supplementation with FO alone tended to decrease feed intake (P<0.10). However, both FO and FOSA, compared with the control, reduced milk fat content in a similar proportion (20%; P<0.05), which suggests that the addition of stearic acid does not alleviate FO-induced MFD. Additional 18:0 showed a relatively low digestibility coefficient but this data does not seem enough to fully explain the negative results, because the decrease in milk cis-9 18:1 concentration linked to dietary marine lipids was partially compensated by this supplement. It is therefore hypothesized that variations in other metabolites (such as odd- and branched-chain and biohydrogenation-derived FA) might contribute to explain the unsuccessful response to the addition of 18:0.
DescripciónTrabajo 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).
Versión del editorhttps://eaap2015.syskonf.pl/
URIhttp://hdl.handle.net/10261/121901
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