Resumo

SANCHEZ ISAZA, CARLOS ARTURO; JIMENEZ ROBAYO, LIGIA MERCEDES  e  BUENO ANGULO, MARTA LUCÍA. Genetic Introgression of Bos indicus (Bovidae) in Colombian Creole Cattle Bos taurus. Acta biol.Colomb. [online]. 2008, vol.13, n.1, pp.131-142. ISSN 0120-548X.

This work evidenced, using a cytogenetics approach, that Bos indicus exerted a genetic introgression of paternal origin on Creole Colombian cattle descendent from Bos taurus. Analysis of chromosome Y morphology was carried out in heparinized blood samples of 67 bulls belonging to seven Colombian breeds. We report 4 sires belonging to the Romosinuano breed (40%) and 10 bulls of the Casanareño breed (100%) with acrocentric Y chromosome which is characteristic of Bos taurus. This finding indicates a high degree of genetic introgression in these two breeds probably caused by the continuous input of zebu stallions in the Colombian Creole breeds. In other five Creole breeds (Blanco Orejinegro -BON-, Chino Santandereano, Costeño con Cuernos, Hartón del Valle and Sanmartinero), the bulls had a submetacentric Y chromosome characteristic of Bos taurus.

Palavras-chave : Y-Chromosome; genetic introgression; Colombian Creole cattle; cytogenetics.

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