Does supplemental 18:0 alleviate fish oil-induced milk fat depression in dairy ewes?
12 páginas, 6 tablas.
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| Language: | English |
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American Dairy Science Association
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| Subjects: | Mammary gland, Marine lipid, Rumen biohydrogenation, Sheep, Stearic acid, |
| Online Access: | http://hdl.handle.net/10261/127866 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100014180 |
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dig-igm-es-10261-1278662021-03-18T16:13:20Z Does supplemental 18:0 alleviate fish oil-induced milk fat depression in dairy ewes? Toral, Pablo G. Hervás, Gonzalo Carreño, David Frutos, Pilar Junta de Castilla y León Ministerio de Economía y Competitividad (España) Mammary gland Marine lipid Rumen biohydrogenation Sheep Stearic acid 12 páginas, 6 tablas. Supplementation of dairy ewe diet with marine lipids may be an effective strategy for modulating milk fatty acid composition but induces milk fat depression (MFD). This syndrome has been associated with a shortage of 18:0 for uptake and Δ9-desaturation that may impair the capacity of the mammary gland to achieve an adequate fluidity for milk fat secretion. On this basis, it was suggested that supplemental 18:0 may contribute to alleviate marine lipid-induced MFD in sheep. To test this hypothesis, 12 lactating ewes were allocated to 1 of 3 lots and used in a 3 × 3 Latin square design with 3 periods of 28 d each and 3 experimental treatments: a total mixed ration without lipid supplementation (control) or supplemented with 20 g/kg of DM of fish oil alone (FO) or in combination with 20 g/kg of DM of 18:0 (FOSA). Diets were offered ad libitum, and animal performance and rumen and milk fatty acid composition were studied at the end of each period. After completing the Latin square trial and following a change-over design, the in vivo digestibility of supplemental 18:0 was estimated using 6 lactating sheep. As expected, diet supplementation with fish oil increased the milk content of some potentially health-promoting fatty acids (e.g., cis-9,trans-11 18:2, trans-11 18:1, 20:5n-3, 22:5n-3, and 22:6n-3), but reduced milk fat concentration and yield (−20% in both FO and FOSA treatments). Thus, although reductions in milk 18:0 and cis-9 18:1 output caused by FO (−81 and −51%, respectively) were partially reversed with FOSA diet (−49 and −27%, respectively), the addition of 18:0 to the diet did not prove useful to alleviate MFD. This response, which could not be fully accounted for by the low digestibility coefficient of supplemental 18:0, may challenge the theory of a shortage of this fatty acid as a mechanism to explain fish oil-induced MFD in sheep. Effects of FO and FOSA on rumen and milk fatty acid composition would support that increases in the concentration of some candidate milk fat inhibitors (e.g., cis-9 16:1 or 10-oxo-18:0) might play a relevant role in this type of MFD. This work was supported by the Council of Castile and Leon (CSI023U13) and the Spanish Ministry of Economy and Competitiveness (MINECO; AGL2011- 23700). P. G. Toral and D. Carreño benefit from a Juan de la Cierva research contract and an FPI predoctoral grant, respectively, from the MINECO. Peer reviewed 2016 artículo http://purl.org/coar/resource_type/c_6501 Journal of Dairy Science, 99: 1133-1144 (2016) 0022-0302 http://hdl.handle.net/10261/127866 10.3168/jds.2015-10304 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100014180 en http://dx.doi.org/10.3168/jds.2015-10304 Sí open American Dairy Science Association |
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Mammary gland Marine lipid Rumen biohydrogenation Sheep Stearic acid Mammary gland Marine lipid Rumen biohydrogenation Sheep Stearic acid |
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Mammary gland Marine lipid Rumen biohydrogenation Sheep Stearic acid Mammary gland Marine lipid Rumen biohydrogenation Sheep Stearic acid Toral, Pablo G. Hervás, Gonzalo Carreño, David Frutos, Pilar Does supplemental 18:0 alleviate fish oil-induced milk fat depression in dairy ewes? |
| description |
12 páginas, 6 tablas. |
| author2 |
Junta de Castilla y León |
| author_facet |
Junta de Castilla y León Toral, Pablo G. Hervás, Gonzalo Carreño, David Frutos, Pilar |
| format |
artículo |
| topic_facet |
Mammary gland Marine lipid Rumen biohydrogenation Sheep Stearic acid |
| author |
Toral, Pablo G. Hervás, Gonzalo Carreño, David Frutos, Pilar |
| author_sort |
Toral, Pablo G. |
| title |
Does supplemental 18:0 alleviate fish oil-induced milk fat depression in dairy ewes? |
| title_short |
Does supplemental 18:0 alleviate fish oil-induced milk fat depression in dairy ewes? |
| title_full |
Does supplemental 18:0 alleviate fish oil-induced milk fat depression in dairy ewes? |
| title_fullStr |
Does supplemental 18:0 alleviate fish oil-induced milk fat depression in dairy ewes? |
| title_full_unstemmed |
Does supplemental 18:0 alleviate fish oil-induced milk fat depression in dairy ewes? |
| title_sort |
does supplemental 18:0 alleviate fish oil-induced milk fat depression in dairy ewes? |
| publisher |
American Dairy Science Association |
| url |
http://hdl.handle.net/10261/127866 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100014180 |
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