TAILIEUCHUNG - Báo cáo sinh học: "Changes in the expression of genetic characteristics across cohorts in skeletal deformations of farmed salmonids"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Changes in the expression of genetic characteristics across cohorts in skeletal deformations of farmed salmonids | Genet. Sel. Evol. 39 2007 529-543 INRA EDP Sciences 2007 DOI gse 2007019 Available online at Original article Changes in the expression of genetic characteristics across cohorts in skeletal deformations of farmed salmonids Antti KAUSEa Ossi RlTOLAb Tuija PAANANENb a MTT Agrifood Research Finland Biotechnology and Food Research Biometrical Genetics 31600 Jokioinen Finland b Finnish Game and Fisheries Research Institute Tervo Fisheries Research and Aquaculture 72210 Tervo Finland Received 2 November 2006 accepted 24 April 2007 Abstract - Genetic analysis of disorder incidence in farmed animals is challenged by two factors. Disorders in different cohorts and environments could be caused by different factors leading to changes in heritability and to less than unity genetic correlations across cohorts. Moreover due to computational limitations liability scale heritabilities at very low incidence may differ from those estimated at higher incidence. We tested whether these two dilemmas occur in skeletal deformations of farmed salmonids using multigeneration data from the Finnish rainbow trout breeding programme and previous salmonid studies. The results showed that heritability was close to zero in cohorts in which management practices maintained incidence at a low level. When there was a management failure and incidence was unusually high heritability was elevated. This may be due to computational limitations at very low incidence and or because deformations are induced by different factors in different cohorts. Most genetic correlations between deformations recorded in different generations were weakly to strongly positive. However also negative correlations between generations were present showing that high liability at one time can be genetically connected to low liability at another time. The results emphasise that genetic architecture of binary traits can be influenced by trait expression. animal breeding animal health deformation .

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