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A Genome Scan for Quantitative Trait Locus by Environment Interactions for Production Traits

M. Lillehammer^*,1, M. Árnyasi^,, S. Lien^*,, H. G. Olsen^*,, E. Sehested^||, J. Ødegård^* and T. H. E. Meuwissen^*

^* Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, N-1432 Ås, Norway
University of Debrecen, Centre of Agricultural Sciences, Department of Animal Sciences, H-4032 Debrecen, Hungary
Bovibank Ltd., PO Box 58, N-1431 Ås, Norway
Centre for Integrative Genetics (CIGENE), Norwegian University of Life Sciences, N-1432 Ås, Norway
^|| GENO Breeding and AI Organisation, N-1432 Ås, Norway

¹ Corresponding author: marie.lillehammer{at}umb.no

Genotype by environment interactions between milk production traits and production level have often been observed. To increase the power of quantitative trait loci (QTL) detection, QTL by environment interaction was included in QTL analyses for the milk, protein, and fat yields. The aim of the study was to detect QTL with interaction effects with the production environment. The QTL effects were modeled through random regression models for within-herd production level. All autosomes except Bos taurus autosome 6 were included in the analysis. A more detailed study of chromosome 6 is planned. For milk yield, 5 QTL were observed, 2 of which had interaction effects with production level (suggestive linkage). For protein yield, 5 QTL were observed, 3 of which had interaction effects (suggestive linkage). For fat yield, 3 QTL were observed, none of which had interaction effects with the environment (suggestive linkage). Thus, some QTL with interaction effects seemingly exist for milk yield and protein yield. For such QTL, estimated correlations between slope and intercept of the effect (close to 1 or –1) indicated that only 2 alleles were segregating. The study indicates that QTL by environment interactions exist, and that random regression models that describe the environment as herd production level can detect this interaction.

Key Words: quantitative trait loci • random regression • autosome • genotype by environment interaction

This article has been cited by other articles:

				M. Lillehammer, M. E. Goddard, H. Nilsen, E. Sehested, H. G. Olsen, S. Lien, and T. H. E. Meuwissen Quantitative Trait Locus-by-Environment Interaction for Milk Yield Traits on Bos taurus Autosome 6 Genetics, July 1, 2008; 179(3): 1539 - 1546. [Abstract] [Full Text] [PDF]