Influence of two sources of information on the accuracy of fertility and hatchability proofs in laying hens was studied on a Rhode Island White-based maternal strain record. Five- or three-generation pedigree and including or not including the laying performance as correlated traits were varied to create four variants of analysis tested against the reference – five-generation, multiple-trait, and post fatum reproduction record of the selected generation. The upper limit of the rank correlation between the reference ranking and the best possible ranking reached 0.9. A significant increase in the accordance of the BLUP proof rankings with the reference one was attributed to the multiple-trait approach Chile the pedigree depth exerted a lesser impact on the reproduction proof accuracy. It is concluded that,with low heritable reproduction traits, five-generation pedigree should be recommended to the threegeneration pedigree and the laying performance, possibly enriched with other early recorded traits,should accompany the breeding value prediction of the reproduction complex.
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