Milk fat depression induced by dietary marine algae in dairy ewes: Persistency of milk fatty acid composition and animal performance responses
9 páginas, 3 tablas, 1 figura.
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| Language: | English |
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American Dairy Science Association
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| Subjects: | Conjugated linoleic acids, Lipid supplementation, Sheep, Trans fatty acid, |
| Online Access: | http://hdl.handle.net/10261/63946 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100000780 |
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dig-igm-es-10261-639462021-03-18T16:13:21Z Milk fat depression induced by dietary marine algae in dairy ewes: Persistency of milk fatty acid composition and animal performance responses Bichi, Elena Hervás, Gonzalo Toral, Pablo G. Loor, Juan J. Frutos, Pilar Ministerio de Economía y Competitividad (España) Consejo Superior de Investigaciones Científicas (España) European Commission Conjugated linoleic acids Lipid supplementation Sheep Trans fatty acid 9 páginas, 3 tablas, 1 figura. Addition of marine algae (MA) to the diet of dairy ruminants has proven to be an effective strategy to enhance the milk content of some bioactive lipids, but it has also been associated with the syndrome of milk fat depression. Little is known, however, about the persistency of the response to dietary MA in sheep. Based on previous experiments with dairy ewes fed sunflower oil plus MA, it was hypothesized that the response might be mediated by time-dependent adaptations of the rumen microbiota, which could be evaluated indirectly through milk fatty acid (FA) profiles. Animal performance and milk FA composition in response to MA in the diet were studied using 36 Assaf ewes distributed in 6 lots and allocated to 2 treatments (3 lots/ treatment) consisting of a total mixed ration (40:60 forage:concentrate ratio) supplemented with 25 g of sunflower oil (SO)/kg of dry matter plus 0 (SO; control diet) or 8 g of MA/kg of dry matter (SOMA diet). Milk production and composition, including FA profile, were analyzed on d 0, 6, 12, 18, 24, 34, 44, and 54 of treatment. Diet supplementation with MA did not affect milk yield but did decrease milk fat content. Differences in the latter were detected from d 18 onward and reached −17% at the end of the experiment (i.e., on d 54). Compared with the control diet, the SOMA diet caused a reduction in milk 18:0 and its desaturation product (cis-9 18:1) that lasted for the whole experimental period. This decrease, together with the progressive increase in some putative fat synthesis inhibitors, especially trans-10 18:1, was related to the persistency of milk fat depression in lactating ewes fed MA. Additionally, inclusion of MA in the diet enhanced the milk content of trans-11 18:1, cis-9,trans-11 18:2, and C20–22 n-3 polyunsaturated FA, mainly 22:6 n-3. Overall, the persistency of the responses observed suggests that the ruminal microbiota did not adapt to the dietary supply of very long chain n-3 polyunsaturated fatty acids. This work was funded by the Spanish Ministry of Economy and Competitiveness (MINECO; AGL2011- 23700). E. Bichi gratefully acknowledges receipt of a predoctoral grant from the Spanish National Research Council (CSIC; JAE Programme) supported by European Social Fund. The authors thank K. J. Shingfield and V. Toivonen (MTT Agrifood Research Finland, Jokioinen, Finland) for invaluable help with FA identification. We also thank the research farm staff from the Instituto de Ganadería de Montaña (León, Spain) for their help in the fieldwork. Peer reviewed 2013 artículo http://purl.org/coar/resource_type/c_6501 Journal of Dairy Science 96: 524-532 (2013) 0022-0302 http://hdl.handle.net/10261/63946 10.3168/jds.2012-5875 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100000780 en http://dx.doi.org/10.3168/jds.2012-5875 open American Dairy Science Association |
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Conjugated linoleic acids Lipid supplementation Sheep Trans fatty acid Conjugated linoleic acids Lipid supplementation Sheep Trans fatty acid |
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Conjugated linoleic acids Lipid supplementation Sheep Trans fatty acid Conjugated linoleic acids Lipid supplementation Sheep Trans fatty acid Bichi, Elena Hervás, Gonzalo Toral, Pablo G. Loor, Juan J. Frutos, Pilar Milk fat depression induced by dietary marine algae in dairy ewes: Persistency of milk fatty acid composition and animal performance responses |
| description |
9 páginas, 3 tablas, 1 figura. |
| author2 |
Ministerio de Economía y Competitividad (España) |
| author_facet |
Ministerio de Economía y Competitividad (España) Bichi, Elena Hervás, Gonzalo Toral, Pablo G. Loor, Juan J. Frutos, Pilar |
| format |
artículo |
| topic_facet |
Conjugated linoleic acids Lipid supplementation Sheep Trans fatty acid |
| author |
Bichi, Elena Hervás, Gonzalo Toral, Pablo G. Loor, Juan J. Frutos, Pilar |
| author_sort |
Bichi, Elena |
| title |
Milk fat depression induced by dietary marine algae in dairy ewes: Persistency of milk fatty acid composition and animal performance responses |
| title_short |
Milk fat depression induced by dietary marine algae in dairy ewes: Persistency of milk fatty acid composition and animal performance responses |
| title_full |
Milk fat depression induced by dietary marine algae in dairy ewes: Persistency of milk fatty acid composition and animal performance responses |
| title_fullStr |
Milk fat depression induced by dietary marine algae in dairy ewes: Persistency of milk fatty acid composition and animal performance responses |
| title_full_unstemmed |
Milk fat depression induced by dietary marine algae in dairy ewes: Persistency of milk fatty acid composition and animal performance responses |
| title_sort |
milk fat depression induced by dietary marine algae in dairy ewes: persistency of milk fatty acid composition and animal performance responses |
| publisher |
American Dairy Science Association |
| url |
http://hdl.handle.net/10261/63946 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100000780 |
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