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Inbreeding and loss of founder alleles in four variations of a conservation programme using circular mating, for Danish Shorthorn Cattle

Published online by Cambridge University Press:  01 August 2011

M. Trinderup ,
J.N. Jørgensen  and
M. Hansen
M. Trinderup
Affiliation:
Department of Animal Science and Animal Health, the Royal Veterinary and Agricultural University, 13 Bülowsvej, 1870 Frederiksberg C, Denmark
J.N. Jørgensen
Affiliation:
Department of Animal Science and Animal Health, the Royal Veterinary and Agricultural University, 13 Bülowsvej, 1870 Frederiksberg C, Denmark
M. Hansen
Affiliation:
The Danish Agricultural Advisory Centre, The National Committee of Danish Cattle Husbandry, 15 Udkjærsvej, Skejby, 8200 Århus N, Denmark
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Summary

The beef cattle breed Danish Shorthorn is used as a model for simulation of four variations of the circular mating scheme running for 50 years. Schemes 1 and 2 used a fixed exchange of bulls between female groups while schemes 3 and 4 used a random exchange of bulls between female groups. The number of bulls used in schemes 1 and 4 was 16 while the number of bulls used in schemes 2 and 3 was 8. Inbreeding levels were computed and gene dropping was applied to estimate the risk of founder allele loss. In the population of year 50 the inbreeding levels for the four mating schemes are not statistically different. The male founder alleles contribute strongly to the population of year 50. The female founder alleles are in greater risk of being lost than the male founder alleles.

Résumé

La race bovine à viande Danish Shorthorn est utilisée comme modèle pour la simulation de quattre variations du schéma circulaire d'accouplement au long de 50 ans. Les schémas 1 et 2 utilisent un échange fixe de taureaux dans des groupes de femmelles. Le nombre de taureaux utilisés dans les schémas 1 et 4 a été de 16, tandis que le nombre de taureaux utilisés dans les schémas 2 et 3 était de 8. On a établi les niveaux de consanguinité et appliqué le comptage des gènes pour estimer le risque de perte d'allèles de base. Dans la population de la 50ème année les niveaux de consanguinité pour les quattre schémas d'accouplement ne sont pas statistiquement différents. Les allèles mâles de base contribuent fortement à la population de la 50ème année. Les allèles femmelles de base se trouvent en plus grand péril de perte que ceux des mâles.

Keywords

Gene droppingDiversityBeef cattle
Type
Research Articles
Information
Animal Genetic Resources/Resources génétiques animales/Recursos genéticos animales , Volume 25 , April 1999 , pp. 99 - 106
Copyright
Copyright © Food and Agriculture Organization of the United Nations 1999

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