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Reduktion der Wirkung des elterlichen Zuchtwertdurchschnitts auf die geschätzten Tierzuchtwerte in gemischten Modellgleichungen
Author(s) -
Wu L.,
Schaeffer L. R.
Publication year - 2000
Publication title -
journal of animal breeding and genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.689
H-Index - 51
eISSN - 1439-0388
pISSN - 0931-2668
DOI - 10.1046/j.1439-0388.2000.00242.x
Subject(s) - inbreeding , best linear unbiased prediction , heritability , statistics , selection (genetic algorithm) , animal model , mixed model , biology , restricted maximum likelihood , mathematics , econometrics , evolutionary biology , population , demography , computer science , maximum likelihood , artificial intelligence , sociology , endocrinology
Summary Selection of animals based on their BLUP evaluations from an animal model results in animals that are closely related which leads to increased rates of inbreeding. The tendency for higher inbreeding rates is greater at low heritability values. Several attempts have been made to reduce the impact of parent average breeding values from animals evaluations in order to reduce inbreeding while not sacrificing genetic response. A method that modifies the rules for forming the inverse of the additive genetic relationship matrix for use in best linear unbiased estimation of breeding values via an animal model was developed. This method and several others were compared analytically and empirically, from the perspective of partitioning the animal solutions into contributions from the data, from progeny, and from the parent average. The ratio of genetic progress to average level of inbreeding showed that the modified relationship matrix method was superior to the other methods. Similar results could be obtained by using artificially high heritability in a usual BLUP analysis.