Genotype by environment interaction estimated by using reaction norms in cattle

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Genotype by environment interaction estimated by using reaction norms in cattle

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/5650

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dc.contributor.advisor Lamberson, William R. en_US
dc.contributor.author Maricle, Elizabeth Ann en_US
dc.date.accessioned 2010-02-23T17:13:24Z
dc.date.available 2010-02-23T17:13:24Z
dc.date.issued 2008 en_US
dc.date.submitted 2008 Summer en
dc.identifier.other MaricleE-072508-T11814 en_US
dc.identifier.uri http://hdl.handle.net/10355/5650
dc.description The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. en_US
dc.description Title from title screen of research.pdf file (viewed on August 13, 2009) en_US
dc.description Includes bibliographical references. en_US
dc.description Thesis (M.S.) University of Missouri-Columbia 2008. en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Animal sciences. en_US
dc.description.abstract The objective of this study was to evaluate GxE by comparing reaction norms among U.S. Angus bulls. Dependent variables were adjusted weights at birth, 205 d weaning, and 365 d yearling. Environments were defined as progeny groups based upon data record location. Data were included in the analysis if each sire had at least 100 progeny, at least 6 progeny per environment, and at least 5 environments represented, while each environment required at least 6 qualifying bulls. The average performance of progeny within each herd environment was defined as the environmental mean. Four statistical models were analyzed using herd environment (categorical (CM) and genotype by environment (GEM)) or environmental mean (continuous environment (CEM) and random regression (RRM)) for estimating breeding values and heritabilities. Fixed effects included year-season, contemporary group, and sex. The RRM produced reaction norms for each bull which were calculated by regressing progeny means within an environment on environment means (SAS PROC GLM and ASREML). Regression coefficients differed among bulls for all traits (P [less than] 0.0001). Heritability estimates with pedigree information ranged from 0.293 to 0.401 for birth weight; 0.141 to 0.289 for weaning weight; and 0.147 to 0.259 for yearling weight. The RRM had the best fit when evaluated using environmental mean. These results suggest that bulls differ in the consistency of their progeny's performance across environments. Estimates of genetic merit of regressions from reaction norms may be a useful selection tool for ranking bulls to be used across diverse environments. en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.subject.lcsh Genotype-environment interaction en_US
dc.subject.lcsh Aberdeen-Angus cattle -- Genetics en_US
dc.subject.lcsh Aberdeen-Angus cattle -- Breeding en_US
dc.title Genotype by environment interaction estimated by using reaction norms in cattle en_US
dc.type Thesis en_US
thesis.degree.discipline Animal sciences en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name M.S. en_US
thesis.degree.level Masters en_US
dc.identifier.merlin .b70627435 en_US
dc.identifier.oclc 430344855 en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2008 Theses
dc.relation.ispartofcollection 2008 Freely available theses (MU)


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