Selection indexes for bulls of beef cattle
2006
Safus, P.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) E-mail:safus.petr@vuzv.cz | Pribyl, J.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Vesela, Z.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Vostry, L.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Stipkova, M.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Stadnik, L.(Ceska Zemedelska Univ., Prague (Czech Republic))
Three selection indexes were constructed for beef bulls as follows: IM for terminal crossing (in dairy herds), IZ for the selection of foundation sires for beef herd and IS for the selection of bulls for beef herd. Each index was constructed in five variants that differed in the number of used traits. The sources of information were breeding values routinely calculated in performance testing. The reliability of partial breeding values that enter into the indexes ranged from 11% to 36%. Reliability influences subsequent accuracy of index selection for total genotype that is in the range of 30% to 46%. Index selection was expressed almost exclusively in genetic gain of direct effects. Direct effects for daily gain until weaning and after weaning are of the highest importance in the breeding objective, accounting for 90% to 96% of the total selection effect. The most important information sources in selection indexes are direct effect of weaning weight (importance of approximately 74% to 95%) and maternal effect of weaning weight (importance of approximately 5% to 7%). The inclusion of daily gain of bulls at performance testing stations with the importance of about 16% in the index decreased the importance of weaning weight. Selection may be aimed at calving ease and weight at 210 days because the importance of the other traits in the index is very low.
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