TAILIEUCHUNG - Báo cáo sinh học: "Exploration of cytoplasmic inheritance as a contributor to maternal effects in Welsh Mountain sheep"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Exploration of cytoplasmic inheritance as a contributor to maternal effects in Welsh Mountain sheep | Genet. Sel. Evol. 40 2008 309-319 Available online at INRA EDP Sciences 2008 DOI gse 2008005 Original article Exploration of cytoplasmic inheritance as a contributor to maternal effects in Welsh Mountain sheep Tracey PRITCHARD Christine Cahalan Ioan Ap DEWI School of the Environment and Natural Resources University of Wales Bangor LL57 2UW UK Received 17 April 2007 accepted 22 October 2007 Abstract - Cytoplasmic effects were investigated using a dataset comprising three breeding groups of Welsh Mountain sheep. The influences of cytoplasmic effects were investigated by comparing animal models with and without a random term representing cytoplasmic effects. The models were applied to the eight-week weight scan weight mean 152 days and ultrasonically scanned muscle and fat depth. The animal model included the random effects of animals and the maternal additive genetic maternal permanent environmental and maternal common environmental effects. In total there were 24 569 10 509 8389 8369 records for the eight-week weight scan weight muscle depth and fat depth respectively. Four subsets were further analysed containing maternal lines with at least five ten fifteen and twenty animals line. There was no evidence of cytoplasmic effects on eight-week weight and muscle depth. Cytoplasmic effects contributed 1-2 of phenotypic variance for scan-weight and fat depth but the effect was generally non-significant P . As the number of animals per maternal line increased the magnitude of cytoplasmic effects also increased for these traits. Direct heritability estimates for the eight-week weight scan weight muscle depth and fat depth using the full dataset were and respectively. cytoplasmic inheritance model maternal effect sheep 1. INTRODUCTION Wagner 25 discussed the importance of mitochondria in animal breeding pointing out that they could be responsible for genetic variation in cytoplasmic effects since they contained maternally

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