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https://hdl.handle.net/1959.11/8887
Title: | Recommendations for Estimation of Variance Components for International Sire Evaluation | Contributor(s): | Tyriseva, A-M (author); Meyer, Karin (author); Fikse, F (author); Ducrocq, V (author); Jakobsen, J (author); Lidauer, MH (author); Mantysaari, EA (author) | Publication Date: | 2010 | Handle Link: | https://hdl.handle.net/1959.11/8887 | Abstract: | This study assessed the impact of alternative parameterizations for the estimation of variance components on practical predictions of breeding values with MACE. Interbull MACE Holstein evaluations for somatic cell count (April 2009) and protein yield (August 2007) were considered. The MACE model was expressed in terms of a random regression model, which facilitates exploitation of principal component and factor analytic approaches. Both methods allow a reduction of the number of parameters to be estimated and benefit from the more parsimonious variance structure. Genetic parameters from different approaches were very similar, when the optimal fit was used. Over-fitting did not affect the estimates, but increased estimation time, whereas fitting too few parameters affected bull rankings in different countries. | Publication Type: | Conference Publication | Conference Details: | Interbull 2010: 2010 Interbull Meeting, Riga, Latvia, 31st May - 4th June, 2010 | Source of Publication: | Proceedings of the 2010 Interbull Meeting, p. 3-9 | Publisher: | International Bull Evaluation Service | Place of Publication: | Uppsala, Sweden | Fields of Research (FoR) 2008: | 060499 Genetics not elsewhere classified | Socio-Economic Objective (SEO) 2008: | 830301 Beef Cattle | HERDC Category Description: | E2 Non-Refereed Scholarly Conference Publication | Publisher/associated links: | http://www-interbull.slu.se/bulletins/bulletin42/Tyriseva.pdf | Series Name: | Interbull Bulletin | Series Number : | 42 |
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Appears in Collections: | Animal Genetics and Breeding Unit (AGBU) Conference Publication |
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