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Communication Dans Un Congrès Année : 2016

Inbreeding and its effects on small and isolated sheep population: the case of Rambouillet's Merino breed

Résumé

Threatened populations that have undergone a strong reduction of their size are subsequently more likely to reproduce under inbred conditions. The adverse effects of such matings on the fitness of the progeny have long been known. Unlike natural populations for which detailed records of genealogy are scarce, domestic and captive populations can benefit from available pedigree data. In this regard, the Merino population from Rambouillet, which has been maintained at small size since its arrival at the Bergerie Nationale de Rambouillet, is a valuable model to study the effects of a small population size associated with a closed registry system on genome structure and genetic diversity. This study showed that, despite a low genetic diversity and a strong structure of the genome, the population management, aiming to minimize matings between the most closely related animals was an adequate breeding policy: the population is not structured into family groups. Furthermore inbreeding depression is low. This project should help to assess the evolutionary potential of the flock. In the long term, it should contribute to the development of recommendations on the management of endangered populations where inbreeding and genetic drift are inevitable, due to their small size.

Domaines

Biologie animale
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Dates et versions

hal-01533871 , version 1 (06-06-2017)

Identifiants

  • HAL Id : hal-01533871 , version 1
  • PRODINRA : 350638

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Adelie Tholance, Coralie Danchin-Burge, Carole Moreno-Romieux, Gwendal Restoux. Inbreeding and its effects on small and isolated sheep population: the case of Rambouillet's Merino breed. XXIV. Plant and Animal Genome Conference (PAG), Jan 2016, San Diego, CA, United States. ⟨hal-01533871⟩
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