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Quantification of milk yield and composition changes as affected by subclinical mastitis during the current lactation in sheep

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Quantification of milk yield and composition changes as affected by subclinical mastitis during the current lactation in sheep

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dc.contributor.author Martí de Olives, Ana María es_ES
dc.contributor.author Díaz, J.R. es_ES
dc.contributor.author Molina Pons, Mª Pilar es_ES
dc.contributor.author Peris Ribera, Cristófol Josep es_ES
dc.date.accessioned 2017-05-11T10:48:22Z
dc.date.available 2017-05-11T10:48:22Z
dc.date.issued 2013-11
dc.identifier.issn 0022-0302
dc.identifier.uri http://hdl.handle.net/10251/80971
dc.description.abstract [EN] The aim of this work was to quantify, on a half-udder basis, the changes in ewe milk yield and composition caused by unilateral subclinical mastitis within the current lactation. Fluctuations due to production level, infection severity, time from the onset of infection, and lactation curves were also studied. Yield and composition of milk from half-udders of unilateral infected ewes were compared between them and with a set of healthy halves using a mixed model. The experiment was completed with a whole-udder approach on the same animals. To test the effect of intramammary infection (IMI) in the 7 wk following the onset of infection, 20 ewes that acquired unilateral subclinical mastitis during lactation and 40 healthy ewes were used. Another group of 20 unilaterally infected ewes from wk 1 of lactation and other 40 healthy ewes were studied to test the effect of IMI on lactational milk yield and composition. The individual milk loss in ewes infected during lactation was 15% for the 7 wk following the onset of infection, and 6.6% more milk was produced by the uninfected half to compensate milk lost by the infected half. Lactational milk yield loss in ewes infected from wk 1 postpartum was 17%. The changes in milk yield were noticed from the week of infection diagnosis. The production level of animals influenced the milk yield changes caused by IMI in such a way that the more productive ewes lost more milk, although these losses were proportional to their production level. On the other hand, infection severity affected milk loss between glands, being more pronounced as somatic cell count increased. A clear decrease of lactose content and casein:protein ratio due to subclinical IMI was observed and it remained throughout the postinfection period. Improving udder health status is necessary to maintain milk production and quality in dairy ewes during lactation es_ES
dc.description.sponsorship The authors thank the regional government of Valencia ("Generalitat Valenciana") for its support by means of a research fellowship. en_EN
dc.language Inglés es_ES
dc.publisher American Dairy Science Association es_ES
dc.relation Generalitat Valenciana es_ES
dc.relation.ispartof Journal of Dairy Science es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Subclinical mastitis es_ES
dc.subject Ewe milk yield es_ES
dc.subject Ewe milk composition es_ES
dc.subject Lactation es_ES
dc.subject.classification PRODUCCION ANIMAL es_ES
dc.title Quantification of milk yield and composition changes as affected by subclinical mastitis during the current lactation in sheep es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.3168/jds.2013-6998
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural - Escola Tècnica Superior d'Enginyeria Agronòmica i del Medi Natural es_ES
dc.description.bibliographicCitation Martí De Olives, AM.; Díaz, J.; Molina Pons, MP.; Peris Ribera, CJ. (2013). Quantification of milk yield and composition changes as affected by subclinical mastitis during the current lactation in sheep. Journal of Dairy Science. 96(12):7698-7708. doi:10.3168/jds.2013-6998 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://doi.org/10.3168/jds.2013-6998 es_ES
dc.description.upvformatpinicio 7698 es_ES
dc.description.upvformatpfin 7708 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 96 es_ES
dc.description.issue 12 es_ES
dc.relation.senia 257145 es_ES
dc.identifier.eissn 1525-3198


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