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Presumptive 1/29 Robertsonian translocation observed in the Argentinean Creole cattle breed

2003; EDP Sciences; Volume: 52; Issue: 2 Linguagem: Inglês

10.1051/animres

1627-3591

C Schifferli, Ariel Marco Bonelli, Claudio Wevar, Ana Mar�a Scilingo, María Victoria Arruga Laviña,

Animal Genetics and Reproduction

A cytogenetic investigation was carried out on 39 Argentinean Creole cattle (8 bulls and 31 cows) from the Experimental Station in Chamical (La Rioja, Argentine).Heparinised blood samples were cultured using a method of Moorhead et al. with some modifications.Karyotypes were established using a chromosomal digital analyser.A presumptive 1/29 Robertsonian translocation was found in one bull which had 2n = 59 chromosomes.The remaining animals appeared chromosomally normal.The 1/29 translocation has been diagnosed in other Creole breeds in America but never in Argentine.The Y chromosome of the sampled bulls had the typical sub-metacentric structure normally occurring in Bos taurus.It is suggested that programmes for genetic and reproductive improvement incorporate chromosomal analysis of bulls and cows with a high genetic value for natural and artificial breeding.Individuals with chromosomal abnormalities could then be eliminated, helping to assure the high fertility rates of this breed.Argentinean Creole cattle breed / genetic selection / 1/29 Robertsonian translocation / fertility Résumé -Translocation Robertsonienne 1/29 observée chez un bovin Créole Argentin.L'analyse cytogénétique a porté sur 39 bovins Créoles Argentins (8 taureaux et 31 vaches) de la station expérimentale de Chamical (La Rioja, Argentine).Les échantillons de sang hépariné ont été mis en culture selon une méthode dérivée de celle de Moorhead et al.Les caryotypes ont été établis à l'aide d'un analyseur chromosomique numérique.Une translocation Robertsonienne 1/29 a été mise en évidence chez un taureau ayant 2n = 59 chromosomes.Les autres animaux sont apparus chromosomiquement normaux.La translocation 1/29 a été diagnostiquée dans d'autres races Créoles en Amérique, mais jamais en Argentine.Qui plus est, le chromosome Y des taureaux testés avait une 119