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Analysis of yield and oil from a series of canola breeding trials. Part I. Fitting factor analytic mixed models with pedigree information
Faculty of Informatics - Papers (Archive)
  • C P Beeck, University of Western Australia
  • W A Cowling, University of Western Australia
  • A B Smith, Wagga Wagga Agricultural Institute
  • Brian R Cullis, University of Wollongong
RIS ID
34648
Publication Date
1-1-2010
Publication Details

Beeck, C. P., Cowling, W. A., Smith, A. B. & Cullis, B. R. (2010). Analysis of yield and oil from a series of canola breeding trials. Part I. Fitting factor analytic mixed models with pedigree information. Genome, 53 (11), 992-1001.

Abstract
In this paper multiplicative mixed models have been used for the analysis of multi-environment trial (MET) data for canola oil and grain yield. Information on pedigrees has been included to allow for the modelling of additive and nonadditive genetic effects. The MET data set included a total of 19 trials (synonymous with sites or environments), which were sown across southern Australia in 2007 and 2008. Each trial was designed as a p-rep design using DiGGeR with the default prespecified spatial model. Lines in their first year of testing were unreplicated, whereas there were two or three replications of advanced lines or varieties. Pedigree information on a total of 578 entries was available, and there were 69 entries that had unknown pedigrees. The degree of inbreeding varied from 0 (55 entries) to nearly fully inbred (337 entries). Subsamples of 2 g harvested grain were taken from each plot for determination of seed oil percentage by near infrared reflectance spectroscopy. The MET analysis for both yield and oil modelled genetic effects in different trials using factor analytic models and the residual plot effects for each trial were modelled using spatial techniques. Models in which pedigree information was included provided significantly better fits to both yield and oil data.
Citation Information
C P Beeck, W A Cowling, A B Smith and Brian R Cullis. "Analysis of yield and oil from a series of canola breeding trials. Part I. Fitting factor analytic mixed models with pedigree information" (2010) p. 992 - 1001
Available at: http://works.bepress.com/bcullis/9/