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Effective population size and inbreeding depression on litter size in rabbits. A case study

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Effective population size and inbreeding depression on litter size in rabbits. A case study

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dc.contributor.author Mohamed Ragab, Mohamed es_ES
dc.contributor.author Sánchez Serrano, Juan Pablo es_ES
dc.contributor.author Baselga Izquierdo, Manuel es_ES
dc.date.accessioned 2017-02-23T11:11:45Z
dc.date.available 2017-02-23T11:11:45Z
dc.date.issued 2015-02
dc.identifier.issn 0931-2668
dc.identifier.uri http://hdl.handle.net/10251/78236
dc.description.abstract The purpose of this study is to use demographic and litter size data on four Spanish maternal lines of rabbits (A, V, H and LP), as a case study, in order to: (i) estimate the effective population size of the lines, as a measure of the rate of increase of inbreeding, and (ii) study whether the inbreeding effect on litter size traits depends on the pattern of its accumulation over time. The lines are being selected for litter size at weaning and are kept closed at the same selection nucleus under the same selection and management programme. The study considered 47 794 l and a pedigree of 14 622 animals. Some practices in mating and selection management allow an increase of the inbreeding coefficient lower than 0.01 per generation in these lines of around 25 males and 125 females. Their effective population size (Ne) was around 57.3, showing that the effect of selection, increasing the inbreeding, was counterbalanced by the management practices, intended to reduce the rate of inbreeding increase. The inbreeding of each individual was broken down into three components: old, intermediate and new inbreeding. The coefficients of regression of the old, intermediate and new inbreeding on total born (TB), number born alive (NBA) and number weaned (NW) per litter showed a decreasing trend from positive to negative values. Regression coefficients significantly different from zero were those for the old inbreeding on TB (6.79 2.37) and NBA (5.92 2.37). The contrast between the coefficients of regression between the old and new inbreeding were significant for the three litter size traits: 7.57 1.72 for TB; 6.66 1.73 for NBA and 5.13 1.67 for NW. These results have been interpreted as the combined action of purging unfavourable genes and artificial selection favoured by the inbreeding throughout the generations of selection. es_ES
dc.description.sponsorship This work was supported by the Spanish Research Projects (CICYT) AGL2008-03274 and ACOMP09/013 (Valencia Generality, Spain). en_EN
dc.language Inglés es_ES
dc.publisher Wiley es_ES
dc.relation Spanish Research Projects (CICYT) [AGL2008-03274 ] es_ES
dc.relation Generalitat Valenciana [ACOMP09/013] es_ES
dc.relation.ispartof Journal of Animal Breeding and Genetics es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Inbreeding es_ES
dc.subject Litter size es_ES
dc.subject New inbreeding es_ES
dc.subject Old inbreeding es_ES
dc.subject Purging es_ES
dc.subject Selection. es_ES
dc.subject.classification PRODUCCION ANIMAL es_ES
dc.title Effective population size and inbreeding depression on litter size in rabbits. A case study es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1111/jbg.12110
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Agrónomos - Escola Tècnica Superior d'Enginyers Agrònoms es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ciencia Animal - Departament de Ciència Animal es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto de Ciencia y Tecnología Animal - Institut de Ciència i Tecnologia Animal es_ES
dc.description.bibliographicCitation Mohamed Ragab, M.; Sánchez Serrano, JP.; Baselga Izquierdo, M. (2015). Effective population size and inbreeding depression on litter size in rabbits. A case study. Journal of Animal Breeding and Genetics. 132(1):68-73. doi:10.1111/jbg.12110 es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion http://dx.doi.org/10.1111/jbg.12110 es_ES
dc.description.upvformatpinicio 68 es_ES
dc.description.upvformatpfin 73 es_ES
dc.type.version info:eu repo/semantics/publishedVersion es_ES
dc.description.volume 132 es_ES
dc.description.issue 1 es_ES
dc.relation.senia 311466 es_ES


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