TAILIEUCHUNG - Báo cáo sinh học: " Fuzzy classification of phantom parent groups in an animal model"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài: Fuzzy classification of phantom parent groups in an animal model | Genetics Selection Evolution BioMed Central Research Fuzzy classification of phantom parent groups in an animal model Freddy Fikse Address Department of Animal Breeding and Genetics Swedish University of Agricultural Sciences Box 7023 75007 Uppsala Sweden Email Freddy Fikse - Open Access Published 28 September 2009 Received 20 August 2009 Accepted 28 September 2009 Genetics Selection Evolution 2009 41 42 doi 1297-9686-41-42 This article is available from http content 41 1 42 2009 Fikse licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Genetic evaluation models often include genetic groups to account for unequal genetic level of animals with unknown parentage. The definition of phantom parent groups usually includes a time component . years . Combining several time periods to ensure sufficiently large groups may create problems since all phantom parents in a group are considered contemporaries. Methods To avoid the downside of such distinct classification a fuzzy logic approach is suggested. A phantom parent can be assigned to several genetic groups with proportions between zero and one that sum to one. Rules were presented for assigning coefficients to the inverse of the relationship matrix for fuzzy-classified genetic groups. This approach was illustrated with simulated data from ten generations of mass selection. Observations and pedigree records were randomly deleted. Phantom parent groups were defined on the basis of gender and generation number. In one scenario uncertainty about generation of birth was simulated for some animals with unknown parents. In the distinct classification one of the two possible generations of birth was randomly chosen to

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