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SITUATION OF INBREEDING IN A RETINTO POPULATION

Published online by Cambridge University Press:  01 August 2011

I. Serrano ,
M. Mayer ,
A. Rodero  and
J. M. Jimenez
I. Serrano
Affiliation:
Department of Genetics, Veterinary Faculty, University of Cordoba, Cordoba, SPAIN
M. Mayer
Affiliation:
Department of Animal Production, University of Nairobi, P.O. Box 29053, Nairobi, KENYA
A. Rodero
Affiliation:
Department of Genetics, Veterinary Faculty, University of Cordoba, Cordoba, SPAIN
J. M. Jimenez
Affiliation:
Research Centre of Agricultural Animal Husbandry, Cadiz, SPAIN
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Summary

The degree of inbreeding was studied for a subpopulation of the beef cattle breed Retintofrom the Cadiz Province in Andalusia (Spain). The pedigree information from 492 female and 25 male breeding animals was analyzed. On the basis of the available information, only the current inbreeding, that is the inbreeding with consideration of three ancestral generations, could be calculated. While close inbreeding is purposely avoided with the bulls, it is of great importance in cows. The average coefficient of inbreeding for cows born inthe years 1982 to 1987 was o 2.35 /;o, although in the great-grandparent generation only 55% of the ancestors were known. Inbreeding was discovered in 17.7% of the cows; 5.8%of the cows had an inbreeding coefficient of 25%. The rate of inbreeding per generation is very high in comparison with other beef cattle breeds and above all in comparison with dual purpose cattle. Because of the manner in which the bulls are used, also considerablenon-current inbreeding has to be expected.

Resumen

Se ha estudiado el grado de consanguinidad en una subpoblaci ôn de la raza bovina de carne Retinto en la provincia andaluza de Câdiz (Espana). Se ha analizado la informaciôn de ascenizencia de 492 hembras y 25 machos seleccionados. Sobre la base de la informaciôn disponible, ûnicamente la consanguinidad corriente, es decir la consanguinidad referida a las tres generaciones pasadas, podrf a ser calculada. Mientras una consanguinidad elevada no es importante para los toros, resulta de gran importanciapara las vacas. El coeficiente medio de consanguinidad para las vacas nacidas entre 1982 y 1987 era de 2.35%, mientras que sôlo se conocfa el 55% de los progenitores en la generaciôn de los bisabuelos. Se ha encontrado consanguinidad en el 17.7% de las vacas; el 5.8% de la vacas resultô tener un coeficiente de consanguinidad del 25%. Latasa de consanguinidad por generaciôn es muy alta en comparaciôn con otras razas de vacuno de carne, y sobre todo en comparaciôn con los vacunos de doble propôsito. Debido a la forma en que se usan los toros, también debe resaltarse unaconsanguinidad poco corriente.

Type
Research Articles
Information
Animal Genetic Resources/Resources génétiques animales/Recursos genéticos animales , Volume 17 , April 1996 , pp. 87 - 93
Copyright
Copyright © Food and Agriculture Organization of the United Nations 1996

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