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https://hdl.handle.net/1959.11/5120
Title: | Comparison of Different Variance Component Estimation Approaches for MACE: Direct and Bottom-up PC | Contributor(s): | Tyriseva, A M (author); Meyer, Karin (author); Jakobsen, J (author); Ducrocq, V (author); Fikse, F (author); Lidauer, M H (author); Mantysaari, E A (author) | Publication Date: | 2009 | Handle Link: | https://hdl.handle.net/1959.11/5120 | Abstract: | Multiple-trait across country evaluation (MACE) is used for international genetic evaluation of dairy bulls. MACE treats records in different countries as different traits. Thus, a sire will get a breeding value for each participating country. Whenever a country makes changes to their national evaluation model, the genetic variance-covariance (VCV) matrix needs to be re-estimated. Estimation of the VCV matrix is a different task. For the Holstein production evaluation, which includes 26 traits, it is not possible to estimate the VCV matrix in a single analysis with the currently available estimation methods and the given time constraints. Hence, the complete matrix is built from analyses of sub-sets. This readily results in a non-positive matrix and a bending procedure (Jorjani et al., 2003) needs to be applied to obtain a positive definite matrix. In addition, the VCV matrix is usually over-parameterized as genetic correlations between countries are generally high. | Publication Type: | Conference Publication | Conference Details: | Interbull 2009: 2009 Interbull Meeting, Barcelona, Spain, 21 - 24 August | Source of Publication: | Interbull Bulletin 40: Proceedings of the 2009 Interbull Meeting, v.40, p. 72-76 | Publisher: | International Bull Evaluation Service | Place of Publication: | Uppsala, Sweden | ISSN: | 1011-6079 | Fields of Research (FoR) 2008: | 070201 Animal Breeding | Socio-Economic Objective (SEO) 2008: | 830302 Dairy Cattle | HERDC Category Description: | E2 Non-Refereed Scholarly Conference Publication | Publisher/associated links: | http://www-interbull.slu.se/bulletins/bulletin40/Tyriseva.pdf |
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Appears in Collections: | Animal Genetics and Breeding Unit (AGBU) Conference Publication |
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