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* Corresponding author 1 GABI - Génétique Animale et Biologie Intégrative 2 IGDR - Institut de Génétique et Développement de Rennes

Abstract : Data obtained from the French Kennel Club and the Fichier National Canin were used to estimate the effect of inbreeding on average litter size and survival in seven French breeds of dog. Depending on the breed, litter sizes were 3.5-6.3 puppies and longevities were 7.7-12.2 years. Estimated heritabilities were 6.0-10.9% for litter size and 6.1-10.1% for survival at 2 years of age. Regression coefficients indicated a negative effect of inbreeding on both individual survival and litter size. Although the impact of baseline inbreeding within breeds appears to be limited, the improper mating of close relatives will reduce biological fitness through significant reduction of litter size and longevity.

Keywords : Canine Inbreeding depression Survival Longevity Litter size

Autor: Grégoire Leroy - Florence Phocas - Benoit Hedan - Etienne Verrier - Xavier Rognon -



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