tailieunhanh - Báo cáo sinh học: "The consequences of including non-additive effects on the genetic evaluation of harvest body weight in Coho salmon (Oncorhynchus kisutch)"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài: The consequences of including non-additive effects on the genetic evaluation of harvest body weight in Coho salmon (Oncorhynchus kisutch) | Gallardo et al. Genetics Selection Evolution 2010 42 19 http content 42 1 19 Ge n et i cs Selection Evolution RESEARCH Open Access The consequences of including non-additive effects on the genetic evaluation of harvest body weight in Coho salmon Oncorhynchus kisutch José A Gallardo 1 Jean P Lhorente2 and Roberto Neira 2 3 Abstract Background In this study we used different animal models to estimate genetic and environmental variance components on harvest weight in two populations of Oncorhynchus kisutch forming two classes . odd- and even-year spawners. Methods The models used were additive with and without inbreeding as a covariable A F and A respectively additive plus common environmental due to full-sib families and inbreeding A C F additive plus parental dominance and inbreeding A D F and a full model A C D F . Genetic parameters and breeding values obtained by different models were compared to evaluate the consequences of including non-additive effects on genetic evaluation. Results Including inbreeding as a covariable did not affect the estimation of genetic parameters but heritability was reduced when dominance or common environmental effects were included. A high heritability for harvest weight was estimated in both populations even and odd when simple additive models A F and A were used. Heritabilities decreased to even and odd when the full model was used A C D F . In this full model the magnitude of the dominance variance was even and odd while the magnitude of the common environmental effect was lower than in both populations. The correlation between breeding values estimated with different models was very high in all cases . higher than . However ranking of the 30 best males and the 100 best females per generation changed when a high dominance variance was estimated as was the case in one of the two populations even . Conclusions Dominance and common environmental variance may be .