<p>The aim of this thesis is to study the selection methods to optimize genetic response in crossbreds by combining both crossbred and purebred information in selection. (1) The locus model study clarified theoretically the meaning and use of genetic parameters related to crossbreds, which are generally not a function of parameters in parental lines. (2) Additive and dominance variances were estimated for egg production traits using linear mixed models and a restricted maximum likelihood. Sire-dam model, additive animal model and dominance animal model were compared in estimating heritability. (3) A combined crossbred and purebred selection method (CCPS) was developed to optimize crossbred response. The method was compared with the pure line selection and crossbred selection methods. Robustness of the method against inappropriate values of genetic parameters was studied. A linear mixed model was presented to apply CCPS. (4) The application of CCPS in animal breeding was extensively discussed.
|Qualification||Doctor of Philosophy|
|Award date||14 Dec 1992|
|Place of Publication||S.l.|
|Publication status||Published - 1992|
- animal breeding
- inbred lines