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dc.contributor.authorLópez Gatius, Fernando
dc.contributor.authorGarcía Ispierto, Irina
dc.contributor.authorSantolaria Blasco, Pilar
dc.contributor.authorYániz Pérez de Albéniz, Jesús
dc.contributor.authorNogareda, Carmina
dc.contributor.authorLópez Bejar, P.
dc.date.accessioned2016-12-05T12:15:03Z
dc.date.issued2006
dc.identifier.issn0093-691X
dc.identifier.urihttp://hdl.handle.net/10459.1/58779
dc.description.abstractA retrospective study involving 2756 pregnancies from two commercial dairy herds in northeastern Spain determined relationships between management, production and reproductive data, and high fertility (conception before 90 days in milk) in high-producing dairy cows. High fertility was registered in 989 (35.9%) cows. The following data were recorded for each animal: herd, repeated animal (cows included two or more times within the study in which data were obtained from different lactational periods), parity (primiparous versus multiparous), previous twinning, reproductive disorders following calving (retained placenta, primary metritis) and at postpartum gynecological examination (incomplete uterine involution, pyometra and ovarian cysts), days in milk at conception, previous estrous synchronization and season of calving and conception. In order to evaluate the possible effect of high production during the peak milk yield on subsequent fertility, daily milk production at Day 50 postpartum was also recorded and cows were classified as high ( 50 kg) and low (<50 kg) producers. Logistic regression analysis indicated no significant effects of herd, repeated animal, previous twinning, reproductive disorders such as primary metritis, incomplete uterine involution, pyometra and ovarian cysts, previous estrous synchronization and season of calving and insemination. Based on the odds ratio, the likelihood of high fertility increased in high-producer cows by a factor of 6.8. High fertility was less likely for multiparous cows (by a factor of 0.35) and for cows suffering placenta retention (by a factor of 0.65). High fertile cows produced a mean of 49.5 kg milk at Day 50 postpartum, in contrast to that 43.2 kg milk of the remainder cows. These findings questionca_ES
dc.description.sponsorshipThe authors thank Paqui Homar for assistance with data collection. García-Ispierto was supported by a FPU grant from the Ministerio de Educación y Ciencia, AP-2004-4279.ca_ES
dc.language.isoengca_ES
dc.publisherElsevierca_ES
dc.relation.isformatofReproducció del document publicat a https://doi.org/10.1016/j.theriogenology.2005.09.027ca_ES
dc.relation.ispartofTheriogenology, 2006, vol. 65, núm. 8, p. 1678-1689ca_ES
dc.rights(c) Elsevier Inc., 2005ca_ES
dc.subjectHigh fertilityca_ES
dc.subjectMilk productionca_ES
dc.subjectDairy cattleca_ES
dc.titleScreening for high fertility in high-producing dairy cowsca_ES
dc.typearticleca_ES
dc.identifier.idgrec010421
dc.type.versionpublishedVersionca_ES
dc.rights.accessRightsinfo:eu-repo/semantics/restrictedAccessca_ES
dc.identifier.doihttps://doi.org/10.1016/j.theriogenology.2005.09.027
dc.date.embargoEndDate2025-01-01


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