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dc.contributor.authorKern, Elisandra Lurdespt_BR
dc.contributor.authorCobuci, Jaime Araújopt_BR
dc.contributor.authorCosta, Claudio Napolispt_BR
dc.contributor.authorDucrocq, Vincentpt_BR
dc.date.accessioned2018-11-30T02:42:57Zpt_BR
dc.date.issued2018pt_BR
dc.identifier.issn0103-9016pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/185289pt_BR
dc.description.abstractLongevity is an important trait due to its relationship with profitability. Type traits have been used as indirect predictors for productive life. The objective of this study was to evaluate the relationship of 20 type traits on length of productive life in Brazilian Holsteins, using a piecewise Weibull proportional hazard model. Three analyses were performed i) productive life was corrected for within herd level of production as a proxy for functional longevity, which included the time-dependent effects of region within year, class of milk production within herdyear, milk production class within lactation number, fat class and protein contents within herd and (variation in) herd size as well as the time-independent fixed effect of age at first calving and the type trait score; ii) the effects related to production were omitted from the first model (true longevity) and iii) with the first model, the effect of type was also studied considering five classes of percentage of type-scored cows within the herd. All analyses were performed using the Survival Kit program. The final score, angularity, top line, udder texture and suspensory ligament showed the strongest relationship with productive life. When type traits were available only for a small fraction of the herd, the cows had a better chance of remaining longer in the herd. The absence of type trait phenotypes was associated with a strong increase of culling risk for the cows. Type traits were not found to be good indirect predictors of productive life in Brazil.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofScientia Agricola. Piracicaba. Vol. 75, n. 6 (nov./dez. 2018), p. 470-478pt_BR
dc.rightsOpen Accessen
dc.subjectGado leiteiropt_BR
dc.subjectConformation traitsen
dc.subjectDairy cattleen
dc.subjectLongevidadept_BR
dc.subjectLongevityen
dc.subjectEstatistica vitalpt_BR
dc.subjectCulling risken
dc.subjectSurvival analysisen
dc.titlePhenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard modelpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001080572pt_BR
dc.type.originNacionalpt_BR


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