Hubert de Rochambeau

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On a effectué une expérience de sélection massale sur la vitesse de croissance entre le sevrage (30 j) et 77 j dans une souche de lapin. La souche sélectionnée se composait de 12 mâles et 60 femelles pendant les 4 premières générations puis de 8 mâles et 40 femelles pendant les 4 suivantes. La souche témoin se composait aussi de 8 mâles et de 40 femelles.(More)
1. Individual growth curves of 7143 chickens selected for the form of the growth curve were fitted using the Laird form of the Gompertz function, BW4=BW0xe(L/K)(1-e-Kt) where BWt is the body weight at age t, BW0 the estimated hatching weight, L the initial specific growth rate and K the maturation rate. 2. Line and sex effects were significant for each(More)
The mitochondrial DNA of the European rabbit (Oryctolagus cuniculus) contains a tandem array of 153-bp repeats in the vicinity of the replication origin of the H-stand. Variation among molecules in the number of these repeats results in inter- and intraindividual length polymorphism (heteroplasmy). Generally, in an individual, one predominant molecular type(More)
The fur of common rabbits is constituted of 3 types of hair differing in length and diameter while that of rex animals is essentially made up of amazingly soft down-hair. Rex short hair coat phenotypes in rabbits were shown to be controlled by three distinct loci. We focused on the "r1" mutation which segregates at a simple autosomal-recessive locus in our(More)
On décrit une méthodologie pour contrôler la consanguinité dans des petites populations d'animaux domestiques, en tenant compte des contraintes d'élevage. On considère une population divisée en groupes de reproduction comprenant un ou plusieurs mâles et des femelles. Un groupe est divisé en classes d'âge, chaque sous-ensemble de la population, défini par le(More)
BACKGROUND For many years gene mapping studies have been performed through linkage analyses based on pedigree data. Recently, linkage disequilibrium methods based on unrelated individuals have been advocated as powerful tools to refine estimates of gene location. Many strategies have been proposed to deal with simply inherited disease traits. However,(More)
The genetic parameters of sexual dimorphism of body weight were estimated in samples of 16 190 chickens and 11328 Muscovy ducks. A multivariate animal model was used, and weights of males and females were treated as different traits. Heritabilities were estimated for males and females, respectively, at 0.28 ! 0.04
To assess the genetic variability in both the nocturnal increase pattern of melatonin concentration and photoresponsiveness in coat changes, an experiment on 422 Rex rabbits (from 23 males) raised under a constant light programme from birth was performed. The animals were sampled at 12 weeks of age, according to 4 periods over a year. Blood samples were(More)
The effects of selection for growth rate on weights and qualitative carcass and muscle traits were assessed by comparing two lines selected for live body weight at 63 days of age and a cryopreserved control population raised contemporaneously with generation 5 selected rabbits. The animals were divergently selected for five generations for either a high (H(More)
la viabilité des portées réduites est légèrement inférieure à celle des portées non modifiées. La différence est plus grande pour les portées fortement réduites;-les portées choisies pour adopter des lapereaux ont une viabilité nettement supérieure à la viabilité moyenne de l'échantillon non modifié (8 7 p. 100 contre 7 8 p. ioo);-la viabilité après(More)