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Genetic Heterosceda...
Genetic Heteroscedasticity for Domestic Animal Traits
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- Felleki, Majbritt (författare)
- Sveriges lantbruksuniversitet,Högskolan Dalarna,Statistik,Swedish University of Agricultural Sciences,Komplexa system - mikrodataanalys,Institutionen för husdjursgenetik (HGEN),Department of Animal Breeding and Genetics
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- Strandberg, Erling, Professor (preses)
- Swedish University of Agricultural Sciences
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- Rönnegård, Lars, Professor (preses)
- Högskolan Dalarna,Statistik
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- Christensen, Ole Fredslund, Senior researcher (opponent)
- Aarhus University, Denmark
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(creator_code:org_t)
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- ISBN 9789157680358
- Uppsala : Sveriges Lantbruksuniversitet, 2014
- Engelska 54 s.
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Serie: Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2014:43
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Abstract
Ämnesord
Stäng
- Animal traits differ not only in mean, but also in variation around the mean. For instance, one sire’s daughter group may be very homogeneous, while another sire’s daughters are much more heterogeneous in performance. The difference in residual variance can partially be explained by genetic differences. Models for such genetic heterogeneity of environmental variance include genetic effects for the mean and residual variance, and a correlation between the genetic effects for the mean and residual variance to measure how the residual variance might vary with the mean.The aim of this thesis was to develop a method based on double hierarchical generalized linear models for estimating genetic heteroscedasticity, and to apply it on four traits in two domestic animal species; teat count and litter size in pigs, and milk production and somatic cell count in dairy cows.The method developed is fast and has been implemented in software that is widely used in animal breeding, which makes it convenient to use. It is based on an approximation of double hierarchical generalized linear models by normal distributions. When having repeated observations on individuals or genetic groups, the estimates were found to be unbiased.For the traits studied, the estimated heritability values for the mean and the residual variance, and the genetic coefficients of variation, were found in the usual ranges reported. The genetic correlation between mean and residual variance was estimated for the pig traits only, and was found to be favorable for litter size, but unfavorable for teat count.
Ämnesord
- LANTBRUKSVETENSKAPER -- Husdjursvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Animal and Dairy Sience (hsv//eng)
- NATURVETENSKAP -- Matematik -- Sannolikhetsteori och statistik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Probability Theory and Statistics (hsv//eng)
- LANTBRUKSVETENSKAPER -- Bioteknologi med applikationer på växter och djur -- Genetik och förädling inom lantbruksvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agricultural Biotechnology -- Genetics and Breeding in Agricultural Sciences (hsv//eng)
Nyckelord
- Quantitative genetics
- genetic heteroscedasticity of residuals
- genetic heterogeneity of environmental variation
- genetic heterogeneity of residual variance
- double hierarchical generalized linear models
- teat count in pigs
- litter size in pigs
- milk yield in cows
- somatic cell count in cows
- Complex Systems – Microdata Analysis
- Komplexa system - mikrodataanalys
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