Discounted expressions of traits in broiler breeding programs

摘要: Abstract The commercially grown broiler usually is a crossbred from specialized purebred sire and dam lines. position of line in the crossbreeding system influences its genetic contribution to expression productive reproductive performance at different stages production column and, thus, breeding goal for given line. In breeding, cumulative discounted expressions (CDE) should be considered define goals multi-trait selection. present study, systematic design application gene flow methodology derive CDE reproduction traits was developed. Factors as influencing magnitude were: (two-way, three-way, four-way cross), selection scheme (with without progeny testing intensity selection), path, trait (production commercial stage either nucleus or multiplier stage), interest rate, time horizon evaluation. Performance data stock were applied analysis. Results indicated that levels significantly affected by all factors studied. more pure lines included system, lower particular path. However, summation paths did not differ much among systems. Progeny decreased increasing generation intervals. higher than those mainly result earlier traits.