Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Scientia Agrícola (Online) |
Texto Completo: | https://www.revistas.usp.br/sa/article/view/147486 |
Resumo: | Longevity 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. |
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Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard modelconformation traitsdairy cattlelongevityculling risksurvival analysisLongevity 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.Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz2018-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/sa/article/view/14748610.1590/1678-992x-2017-0153Scientia Agricola; v. 75 n. 6 (2018); 470-478Scientia Agricola; Vol. 75 No. 6 (2018); 470-478Scientia Agricola; Vol. 75 Núm. 6 (2018); 470-4781678-992X0103-9016reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USPenghttps://www.revistas.usp.br/sa/article/view/147486/141002Copyright (c) 2018 Scientia Agricolainfo:eu-repo/semantics/openAccessKern, Elisandra LurdesCobuci, Jaime AraujoCosta, Cláudio NapolisDucrocq, Vincent2018-06-25T17:28:21Zoai:revistas.usp.br:article/147486Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2018-06-25T17:28:21Scientia Agrícola (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model |
title |
Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model |
spellingShingle |
Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model Kern, Elisandra Lurdes conformation traits dairy cattle longevity culling risk survival analysis |
title_short |
Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model |
title_full |
Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model |
title_fullStr |
Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model |
title_full_unstemmed |
Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model |
title_sort |
Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model |
author |
Kern, Elisandra Lurdes |
author_facet |
Kern, Elisandra Lurdes Cobuci, Jaime Araujo Costa, Cláudio Napolis Ducrocq, Vincent |
author_role |
author |
author2 |
Cobuci, Jaime Araujo Costa, Cláudio Napolis Ducrocq, Vincent |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Kern, Elisandra Lurdes Cobuci, Jaime Araujo Costa, Cláudio Napolis Ducrocq, Vincent |
dc.subject.por.fl_str_mv |
conformation traits dairy cattle longevity culling risk survival analysis |
topic |
conformation traits dairy cattle longevity culling risk survival analysis |
description |
Longevity 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. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-12-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://www.revistas.usp.br/sa/article/view/147486 10.1590/1678-992x-2017-0153 |
url |
https://www.revistas.usp.br/sa/article/view/147486 |
identifier_str_mv |
10.1590/1678-992x-2017-0153 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://www.revistas.usp.br/sa/article/view/147486/141002 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2018 Scientia Agricola info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2018 Scientia Agricola |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz |
publisher.none.fl_str_mv |
Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz |
dc.source.none.fl_str_mv |
Scientia Agricola; v. 75 n. 6 (2018); 470-478 Scientia Agricola; Vol. 75 No. 6 (2018); 470-478 Scientia Agricola; Vol. 75 Núm. 6 (2018); 470-478 1678-992X 0103-9016 reponame:Scientia Agrícola (Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Scientia Agrícola (Online) |
collection |
Scientia Agrícola (Online) |
repository.name.fl_str_mv |
Scientia Agrícola (Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
scientia@usp.br||alleoni@usp.br |
_version_ |
1787713261046595584 |