Báo cáo sinh học: " Changes in genetic correlations by index selection Y Itoh" docx

... expressed as : Original article Changes in genetic correlations by index selection Y Itoh Kyoto University, Department of Animal Science, Faculty of Agriculture, Kyoto 606, Japan (Received ... June 1991) Summary - A formula expressing changes in genetic variances and covariances by index selection in one generation is derived. Then chang...

Ngày tải lên: 14/08/2014, 20:20

... 10 T lines (Table 1). On the morning of the fol- lowing day, a blood sample was obtained from each bird using a pre-heparinized needle and syringe and the birds were killed by intravenous injection ... The research was funded by Defra. The Roslin Institute is sup- ported by a core grant from the BBSRC. The commercial lines were kindly donated by the Cobb Breeding Company Ltd, Chelmsf...

Ngày tải lên: 14/08/2014, 13:21

... many structural traits are typically recorded as binary traits and are present in both farmed and wild species. These often broadly-defined traits are innately deter- mined by multiple underlying factors, but ... captured in the trait definition when using simple binary classification. In some cases, they also occur at very low incidence. Thus, the phenomenon of spatially and temporally...

Ngày tải lên: 14/08/2014, 13:22

... varies by community. The Flemish community introduced an entrance examination (i.e. everyone passing the exam is eligible to register in uni- versity training) while the French community opted ... salaries during the office based training period (minimum two out of five years) is publicly financed. However, i n practice, the subsidy is often the trainee’s income only, which may explain th...

Ngày tải lên: 18/06/2014, 17:20

... respectively. In practice the EBV for milk yield may be combined with the EBV for herdlife (predicted from EBV of type traits) in an overall selection index. The efficiency of such ... = 0.978 efficiency). Ignoring type traits altogether gives an r IH of 0.785. Finally, using a selection index with milk yield and HL itself results in...

Ngày tải lên: 09/08/2014, 18:22

... selection intensity in female ducks (i = 1.271), constrained selection based on a phenotypic selection index or a genetic index could increase the expected genetic gains in ... gains in NEGG52 by a factor of 3.5 or 5.7, respectively, while maintaining constant EW40 and BW40. genetic gain / selection / laying duck / restricted se...

Ngày tải lên: 09/08/2014, 18:22

... are obtained by solving the following mixed model equations (MME) Then, in the case of the AM, denoting Cov([u’ v’]’, a/ )[Var(a)]- l by H’, the BLUP of additive genetic ... of the combined-merit AM and RAM. THEORY Backsolving in the combined-merit AM Assuming a MQTL and one observation per animal for simplicity, the AM discussed by Fernan...

Ngày tải lên: 09/08/2014, 18:22

... appeared to decline for the 2 bristle systems analysed by Rasmuson (1952). A reduction of the within-line genetic variance has been reported by Tantawy (1957) for wing and thorax ... and egg-laying (Lopez-Fanjul and Jddar, 1977), fluctuating over generations or even diminishing in the remaining instances. For perform- within-line component of...

Ngày tải lên: 09/08/2014, 22:22

... accuracy of MA-BLUP breeding values is little affected by the pedigree depth and hardly affected by missing genotypes. However, it is strongly affected by the inclusion of YD in the MA-BLUP system ... estimated genetic variances in DYD and DYD-YD models. The amplitude in DYD-YD models is smaller for both and . The benefit of using YD in addition to DYD is also confirmed by t...

Ngày tải lên: 14/08/2014, 13:21

... factor analytic (FA) form introduced by Smith et al. [6] is inter- mediate in parsimony and is widely used in the analysis of MET data from most Australian plant breeding pro- grams. Kelly et al. ... efficiency is maintained by only forming some ele- ments of A. In summary, this paper adopts the genetic model of Oakey et al. [2] with an extension to multi-environment trial data as...

Ngày tải lên: 14/08/2014, 13:21