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handle: 10261/22842
[FR] On a obtenu des échantillons sanguins de 412 lapins de la race Sylvestre Espagnole, appartenant à six populations localisées dans le Nord (Navarra l), Nord-Est (Zaragoza 1, Zaragoza 2) et Centre de l‘Espagne (Toledo 1, Toledo 2, Toledo 3). On a étudié 17 marqueurs génétiques, par electrophorèse (amidon et polyacrylamide). Les études révèlent un niveau de polymorphisme génétique haut dans quelques loci quand on compare ces populations sylvestres avec des populations domestiques. Seulement six loci (Ak, To, Ca-l, Cat, Dia-l et Cp) étaient monomorphiques; sept (Hb, Pgd, Es-l, Es-2, Ca-2, Est-7 et Tf) étaient dialléliques; deux (Dia-2 et Es-3) étaient trialléliques; et deux (Ada et Hk) étaient tétraalléliques. C’est pour cela que le pourcentage de loci polymorphiques (2 47;s SW) est plus haut que dans des populations domestiques, spécialement dans les populations sylvestres du Nord et du Centre (ooe le nombre moyen d‘allèles1 locus est l ,94). Le coefficient de consanguinité dans la population totale, estimé par la méthode de Wright (1943) indicative de l‘effet de Wahlund (F=S,66), était plus bas que l‘estimé par la méthode de Kidd et al. (1980), comme mesure de la consanguinité (f= IS,62). Ce dernier coefficient était plus haut que l’observé dans d‘autres populations de lapins. Les estimations des distances génétiques entre cinq populations montrent l‘existence de facteurs (effet fondateur, barrières géographiques comme des rivières, montagnes, etc.) qui pourraient, plutôt que les distances géographiques, expliquer le fait que la population du Nord peut être groupée avec deux populations Centrales (Toledo 2 et Toledo 3) pendant que les populations du Nord-Est (Zaragoza 1 et Zaragoza 2) peuvent être groupées avec la population Centrale Toledo 1. Le premier groupe montre plus de similitude génétique avec des populations domestiques que le dernier groupe.
[EN] Blood samples from 412 Spanish wild rabbits belonging to six populations located in the Northern (Navarra l), North-Eastern (Zaragoza 1, Zaragoza 2) and Central Spain (Toledo 2, Toledo 3) were tested for 17 genetic markers in this study, using starch and polyacrylamnide gel electrophoresis. Population studies revealed a higher levelo f genetic polymorphism for some of these 17 loci in wild rabbit populations, when compared to non wild rabbit populations. Only six loci (Ak, To, Ca-l, Cat, Dia-l and Cp) were monomorphic; seven (Hb, Pgd, Es-l, Es-2, Ca-2, Es-7. and Tfl were diallelic; two (Dia-2 and Est-3) were triallelic; a d the remaining two (Ada and Hk) were tetraallelic. Thus, the percentage of polymorphic loci (1 47; I 58.8) is higher than in populations bred under captivity,. specially in the Northern and Central wild rabbit populations (where the average number of alleles/locus is 1.94). The inbreeding coefficient in the total population, as estimated by Wright’s method (1943), indicative of the Wahlund’s effect (F = 5.66), was lower than that estimated by Kidd et al’s. method (1980), attributable to consanguineous matings within the population (f = 15.62), the latter being highei than in other rabbit populations. The study of genetic distances among the five populations reveals that factors other than geographic distance (e.g. founder effect, geographic barriers such as rivers, mountains, etc.) may explain the findings that the Northern population can be grouped with two of the Central populations (Toledo 2 and Toledo 3) whereas the North-Eastern populations (Zaragoza1 and Zaragoza 2) can be grouped with another Central population (Toledo 1). The former group shows more genetic similarities with populations bred under captivity than the latter.
11 Pag., 5 Fig., 9 Tabl. In Rouvier, R. (ed.) . Races et populations locales méditerranéennes de lapins : gestion génétique et performances zootechniques . Zaragoza : CIHEAM-IAMZ, 1990. p. 53-63 : 15 ill. 15 ref. Summaries (En, Fr). (Options Méditerranéennes : Série A. Séminaires Méditerranéens ; n. 8). Races et Populations Locales Méditerranéennes de Lapins: Gestion Génétique et Performances Zootechniques, 9-11 Feb 1987, 23-26 Oct 1988, Zaragoza (Spain), Saida (Tunisia).
This work was supported by the research project “New experimental genetic aspects oriented to the control and improvement of the rabbit livestock production in Spain“, supported by the Comisión Asesora Científica y Técnica (C.A.I.C.Y.T.). We wish to acknowledge the cooperation of Diputación de Navarra, who made the arrangementfso r providing the animals, and the financial help of CAZAR, CAI and Cajas Rurales de Aragón.
Peer reviewed
distances génétiques, genetic distance, genetic variation, marqueurs sanguins, Spanish wild rabbits, Blood markers, Genetic variation, lapins sylvestres espagnols, Polymorphismes biochimiques, variation génétique, Biochemical polymorphisms
distances génétiques, genetic distance, genetic variation, marqueurs sanguins, Spanish wild rabbits, Blood markers, Genetic variation, lapins sylvestres espagnols, Polymorphismes biochimiques, variation génétique, Biochemical polymorphisms
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