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Competing risk analyses of longevity in Duroc sows with a special emphasis on leg conformation
dc.contributor.author | Fernández de Sevilla, X. | |
dc.contributor.author | Fàbrega-Romans, Emma | |
dc.contributor.author | Tibau , Joan | |
dc.contributor.author | Casellas, Joaquim | |
dc.contributor.other | Producció Animal | ca |
dc.date.accessioned | 2024-08-16T06:35:53Z | |
dc.date.available | 2024-08-16T06:35:53Z | |
dc.date.issued | 2009-01-01 | |
dc.identifier.citation | De Sevilla, X. Fernàndez, E. Fàbrega, J. Tibau, and J. Casellas. 2009. “Competing Risk Analyses of Longevity in Duroc Sows With a Special Emphasis on Leg Conformation.” Animal 3 (3): 446–453. doi: 10.1017/s1751731108003583 | ca |
dc.identifier.uri | http://hdl.handle.net/20.500.12327/3126 | |
dc.description.abstract | A competing risk approach was used to evaluate the influence of several factors on culling risk for 587 Duroc sows. Three different analyses were performed according to whether sow failure was due to death during productive life (DE) or to one of two causes for voluntary culling: low productivity (LP) and low fertility (LF). Sow survival was analyzed by the Cox model. Year at first farrowing (batch effect) significantly affected sow survival in all three analyses ( P < 0.05 for DE and P < 0.001 for LP and LF) whereas farm of origin accounted for relevant variation in the LP and LF analyses. LP culling increased with backfat thickness of more than 19 mm at the end of the growth period ( P < 0.05), bad teat condition ( P < 0.05) and reduced piglets born alive ( P < 0.001). For the LF competing risk analysis, culling increased with age at first farrowing ( P < 0.1). Special emphasis was placed on the influence of leg and teat conformation on sow survivability, although they did not affect sow failure due to DE ( P > 0.1). The overall leg-conformation score significantly influenced sow longevity in LP ( P < 0.001) and LF competing risk analyses ( P < 0.001), showing a higher hazard ratio (HR) for poorly conformed sows (1.013 and 4.366, respectively) than for well-conformed sows (0.342 and 0.246, respectively). Survival decreased with the presence of abnormal hoof growth in LP and LF analyses (HR 5 3.372 and 6.002, respectively; P < 0.001) and bumps or injuries to legs (HR 5 4.172 and 5.839, respectively; P < 0.01). Plantigradism reduced sow survival in the LP analysis ( P < 0.05), while sickle-hooked leg ( P < 0.05) impaired sow survival in the fertility-specific analysis. Estimates of heritability for longevity related to LP culling ranged from 0.008 to 0.024 depending on the estimation procedure, whereas heritability values increased to between 0.017 and 0.083 in LF analysis. These analyses highlighted substantial discrepancies in the sources of variation and genètic background of sow longevity depending on the cause of failure. The estimated heritabilities suggested that direct genetic improvement for sow longevity seemed feasible, although only a small genetic progress was expected. | ca |
dc.description.sponsorship | The authors would like to thank Selección Batallé S.A. (Riudarenes, Spain) for their cooperation. Thanks are also due to Dr J. Piedrafita (Universitat Autònoma de Barcelona, Bellaterra, Spain) for collaboration and to the technicians of the IRTA-Pig Testing Centre (Monells, Spain) for their assistance. We are also indebted to two anonymous referees for their helpful comments on the manuscript. The present study is part of the Welfare Quality® research project (FOOD-CT-2004- 506508), which has been co-financed by the European Commission within the Sixth Framework Program. The text represents our views and does not necessarily represent a position of the Commission, who will not be liable for the use made of such information. | ca |
dc.format.extent | 8 | ca |
dc.language.iso | eng | ca |
dc.publisher | Elsevier | ca |
dc.relation.ispartof | Animal | ca |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 International | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.title | Competing risk analyses of longevity in Duroc sows with a special emphasis on leg conformation | ca |
dc.type | info:eu-repo/semantics/article | ca |
dc.description.version | info:eu-repo/semantics/publishedVersion | ca |
dc.rights.accessLevel | info:eu-repo/semantics/openAccess | |
dc.embargo.terms | cap | ca |
dc.relation.projectID | EC/FP6/506508/EU/Integration of animal welfare in the food quality chain: from public concern to improved welfare and transparent quality/WELFARE QUALITY | ca |
dc.subject.udc | 575 | ca |
dc.subject.udc | 619 | ca |
dc.identifier.doi | https://doi.org/10.1017/S1751731108003583 | |
dc.contributor.group | Benestar Animal | ca |
dc.contributor.group | Genètica i Millora Animal | ca |
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