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Open Access Research

Non-random mating for selection with restricted rates of inbreeding and overlapping generations

Anna K Sonesson* and Theo HE Meuwissen

Author Affiliations

Institute for Animal Science and Health (ID-Lelystad), P.O. Box 65, 8200 AB Lelystad, The Netherlands

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Genetics Selection Evolution 2002, 34:23-39  doi:10.1186/1297-9686-34-1-23

The electronic version of this article is the complete one and can be found online at: http://www.gsejournal.org/content/34/1/23


Received:24 November 2000
Accepted:8 August 2001
Published:15 January 2002

© 2002 INRA, EDP Sciences

Abstract

Minimum coancestry mating with a maximum of one offspring per mating pair (MC1) is compared with random mating schemes for populations with overlapping generations. Optimum contribution selection is used, whereby ΔF is restricted. For schemes with ΔF restricted to 0.25% per year, 256 animals born per year and heritability of 0.25, genetic gain increased with 18% compared with random mating. The effect of MC1 on genetic gain decreased for larger schemes and schemes with a less stringent restriction on inbreeding. Breeding schemes hardly changed when omitting the iteration on the generation interval to find an optimum distribution of parents over age-classes, which saves computer time, but inbreeding and genetic merit fluctuated more before the schemes had reached a steady-state. When bulls were progeny tested, these progeny tested bulls were selected instead of the young bulls, which led to increased generation intervals, increased selection intensity of bulls and increased genetic gain (35% compared to a scheme without progeny testing for random mating). The effect of MC1 decreased for schemes with progeny testing. MC1 mating increased genetic gain from 11–18% for overlapping and 1–4% for discrete generations, when comparing schemes with similar genetic gain and size.

Keywords:
mating; overlapping generations; selection; rate of inbreeding; genetic response; optimum contribution

Research

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