Use of high doses of 18:0 to try to mitigate the syndrome of milk fat depression in dairy ewes fed marine lipids
8 páginas, 3 tablas.
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| Format: | artículo biblioteca |
| Language: | English |
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Elsevier
2018
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| Subjects: | Fish oil, Low-fat milk syndrome, Ruminant nutrition, Sheep, Stearic acid, |
| Online Access: | http://hdl.handle.net/10261/158280 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100014180 |
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dig-igm-es-10261-1582802021-03-18T16:13:22Z Use of high doses of 18:0 to try to mitigate the syndrome of milk fat depression in dairy ewes fed marine lipids Toral, Pablo G. Hervás, Gonzalo Frutos, Pilar Ministerio de Economía y Competitividad (España) Junta de Castilla y León European Commission Fish oil Low-fat milk syndrome Ruminant nutrition Sheep Stearic acid 8 páginas, 3 tablas. Despite the benefits of adding marine lipids rich in n-3 polyunsaturated fatty acids (PUFA) to ruminant diets to improve milk fatty acid (FA) composition, this strategy induces milk fat depression (MFD), precluding its application under practical conditions. The MFD elicited by marine lipids has tentatively been explained by a shortage of available ruminal 18:0 for mammary uptake and Δ9-desaturation to cis-9 18:1, which might increase milk fat melting point and impair fat secretion. This hypothesis was challenged in a recent experiment in dairy ewes, as diet supplementation with 2% DM of 18:0 did not prove useful to alleviate fish oil-induced MFD. However, further research with higher levels of 18:0 inclusion seemed advisable. Therefore, in this study, 16 lactating ewes were allocated to 4 treatments lasting 27 days: a total mixed ration containing no additional lipid (control) or 2% DM of fish oil alone (FO) or in combination with 3% (FOSA3) or 4% (FOSA4) of stearic acid. Fish oil supplementation induced MFD, but addition of 18:0, regardless of the dose, was not able to mitigate it: decreases in milk fat content reached 19% in FO, 20% in FOSA3 and 27% in FOSA4. The reduction in milk 18:0 concentration due to FO (−81%) was completely reverted neither by FOSA3 (−41%) nor by FOSA4 (−25%), and something similar occurred with cis-9 18:1 concentrations (12.53, 5.91, 9.50 and 11.28 g/100 FA, in control, FO, FOSA3 and FOSA4, respectively). Increases in some candidate milk fat inhibitors in FO and FOSA diets (e.g., cis-9 16:1, cis-11 18:1, trans-10 18:1, 10-oxo-18:0, or trans-10 cis-15 18:2) might account for the absence of a positive effect of dietary 18:0. The estimated milk fat melting point was lower in the three supplemented diets (on average, −2.6 °C compared with the control). In conclusion, addition of high doses of stearic acid to the diet (at 3 and 4% DM) was not able to alleviate the MFD caused by the concomitant supplementation with fish oil. This lack of response would further challenge the hypothesis suggesting that fish oil-induced MFD is mainly explained by decreased ruminal production of 18:0 and subsequent problems of milk fat fluidity, but further research would be still needed. This work was supported by the Council of Castile and Leon (CSI023U13). The authors thank D. Carreño, A. G. Mendoza and L. Rodríguez for their help with experimental animals and fatty acid analysis. Pablo G. Toral benefits from a Ramón y Cajal research contract from the Spanish Ministry of Economy, Industry and Competitiveness (RYC-2015-17230), co-funded by the European Regional Development Fund. Peer reviewed 2017-12-18T13:01:37Z 2017-12-18T13:01:37Z 2018 artículo http://purl.org/coar/resource_type/c_6501 Animal Feed Science and Technology 236: 68-75 (2018) 0377-8401 http://hdl.handle.net/10261/158280 10.1016/j.anifeedsci.2017.12.001 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100014180 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/RYC-2015-17230 Postprint http://dx.doi.org/10.1016/j.anifeedsci.2017.12.001 Sí open Elsevier |
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dig-igm-es |
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Biblioteca del IGM España |
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English |
| topic |
Fish oil Low-fat milk syndrome Ruminant nutrition Sheep Stearic acid Fish oil Low-fat milk syndrome Ruminant nutrition Sheep Stearic acid |
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Fish oil Low-fat milk syndrome Ruminant nutrition Sheep Stearic acid Fish oil Low-fat milk syndrome Ruminant nutrition Sheep Stearic acid Toral, Pablo G. Hervás, Gonzalo Frutos, Pilar Use of high doses of 18:0 to try to mitigate the syndrome of milk fat depression in dairy ewes fed marine lipids |
| description |
8 páginas, 3 tablas. |
| author2 |
Ministerio de Economía y Competitividad (España) |
| author_facet |
Ministerio de Economía y Competitividad (España) Toral, Pablo G. Hervás, Gonzalo Frutos, Pilar |
| format |
artículo |
| topic_facet |
Fish oil Low-fat milk syndrome Ruminant nutrition Sheep Stearic acid |
| author |
Toral, Pablo G. Hervás, Gonzalo Frutos, Pilar |
| author_sort |
Toral, Pablo G. |
| title |
Use of high doses of 18:0 to try to mitigate the syndrome of milk fat depression in dairy ewes fed marine lipids |
| title_short |
Use of high doses of 18:0 to try to mitigate the syndrome of milk fat depression in dairy ewes fed marine lipids |
| title_full |
Use of high doses of 18:0 to try to mitigate the syndrome of milk fat depression in dairy ewes fed marine lipids |
| title_fullStr |
Use of high doses of 18:0 to try to mitigate the syndrome of milk fat depression in dairy ewes fed marine lipids |
| title_full_unstemmed |
Use of high doses of 18:0 to try to mitigate the syndrome of milk fat depression in dairy ewes fed marine lipids |
| title_sort |
use of high doses of 18:0 to try to mitigate the syndrome of milk fat depression in dairy ewes fed marine lipids |
| publisher |
Elsevier |
| publishDate |
2018 |
| url |
http://hdl.handle.net/10261/158280 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100014180 |
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