Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model
| Autor: | Elisandra Lurdes Kern, Claudio Napolis Costa, Jaime Araujo Cobuci, Vincent Ducrocq |
|---|---|
| Přispěvatelé: | Universidade Federal do Rio Grande do Sul (UFRGS), Empresa Brasileira de Pesquisa Agropecuária (Embrapa), Ministério da Agricultura, Pecuária e Abastecimento [Brasil] (MAPA), Governo do Brasil-Governo do Brasil, Génétique Animale et Biologie Intégrative (GABI), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, Kern, Elisandra Lurdes |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
media_common.quotation_subject [SDV]Life Sciences [q-bio] Longevidade Culling Biology survival analysis 03 medical and health sciences conformation traits dairy cattle longevity culling risk Statistics medicine lcsh:Agriculture (General) Udder Dairy cattle media_common 2. Zero hunger [SDV.GEN]Life Sciences [q-bio]/Genetics Gado leiteiro Proportional hazards model 0402 animal and dairy science Longevity 04 agricultural and veterinary sciences Fixed effects model lcsh:S1-972 040201 dairy & animal science [SDV.GEN.GA]Life Sciences [q-bio]/Genetics/Animal genetics 030104 developmental biology medicine.anatomical_structure Herd Trait Estatistica vital |
| Zdroj: | Scientia Agricola, Volume: 75, Issue: 6, Pages: 470-478, Published: DEC 2018 Scientia Agricola Scientia Agricola, Escola Superior de Agricultura, 2018, 75 (6), pp.470-478. ⟨10.1590/1678-992X-2017-0153⟩ Scientia Agricola 6 (75), 470-478. (2018) Scientia Agricola v.75 n.6 2018 Scientia Agrícola Universidade de São Paulo (USP) instacron:USP Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Scientia Agricola, Vol 75, Iss 6, Pp 470-478 |
| ISSN: | 0103-9016 1678-992X |
| Popis: | International audience; 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 catering 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. |
| Databáze: | OpenAIRE |
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