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Systems of mating to reduce inbreeding in selected populations

Published online by Cambridge University Press:  02 September 2010

A. Caballero ,
E. Santiago  and
M. A. Toro
A. Caballero
Affiliation:
Institute of Cell, Animal and Population Biology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT
E. Santiago
Affiliation:
Departamento de Biologi'a Funcional, Universidad de Oviedo, 33071 Oviedo, Spain
M. A. Toro
Affiliation:
Instituto Nactional de Investigation Agrarias, Carretera de la Coruña sin, 28040, Madrid, Spain
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Abstract

Stochastic simulation is used to compare different systems of mating to reduce rates of inbreeding in selection programmes with phenotypic or animal model best linear unbiased prediction (BLUP) evaluation. Compensatory mating (the mating between individuals from the largest selected families to individuals from the smallest) turns out to be proportionately about 0-30 more effective than minimum coancestry matings for situations with low rates of inbreeding, such as phenotypic selection or high population size, although the advantage is less apparent if common environmental effects are important. A modification of this system of mating is proposed which can be applied for overlapping generations, and this is shown to reduce rates of inbreeding proportionately by about 0-50 more than for discrete generations. Under high inbreeding, however, such as for BLUP selection and small population size, minimum coancestry matings, or even avoidance of sib matings are more effective. A procedure combining compensatory and minimum coancestry matings is also simulated and gives the largest reductions in the rate of inbreeding. The effects of these and other systems of mating on the rate of inbreeding are shown to occur through a reduction in the cumulative effect of selection and a deviation from Hardy-Weinberg proportions.

Keywords

best linear unbiased predictioninbreedingmating systemsstochastic models
Type
Research Article
Information
Animal Science , Volume 62 , Issue 3 , June 1996 , pp. 431 - 442
Copyright
Copyright © British Society of Animal Science 1996

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