Abstract
Data were collected from one pedigreed generation of Norfa layers. 144 cocks and 432 hens were used, each cock artificially inseminated with three hens. 607 completely recorders of pedigreed progeny were used. Three traits were used (BWM, EWM, and EN42wk). Ten different single trait multisource indices were constructed for each trait by using three sources of information (OP, FS and HS) and two methods of calculating economic values. The results showed that the heritability of BWM was high while the heritability values of EWM and EN42wk were moderate. There were positive phenotypic and genetic correlations between BWM and EWM. On the other hand, Phenotypic and genetic correlations between EN42wk and both of BWM and EWM were negative. The results indicate that using Kolstad (1975) method for calculating economic values of the traits produced more accurate single trait multisource indices comparing to those constructed by using Lamont (1991) method. The results show that the own performance as a source of information had the highest value in the different single trait multisource indices followed by FS and HS. The most accurate single trait multisource index was ISOP+FS+HS. On the other hand, the lowest accurate index was ISFS+HS which excluded the own performance from its computations.