Sub-indexes for bulls of Holstein breed in the Czech Republic
Safus, P.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic))E-mail:safus.petr@vuzv.cz | Stipkova, M.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Stadnik, L.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju) | Pribyl, J.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Cermak, V.(Ceskomoravsky Svaz Chovatelu, Hradistko pod Mednikem (Czech Republic))
Sub-indexes were constructed for bulls of the Holstein breed according to groups of production traits - production index for milk (IPH), sub-indexes for reproduction (IRH), longevity (IDH), health resistance (IOH) and fitness (IFH). The sub-indexes were compared with the total index (SIH). The accuracy of the indexes were as follows: SIH 69.30%, IPH 83.32%, IRH 56.04%, IDH 9.80%, IOH 15.57%, IFH 9.86%. All indexes were standardised to have the mean 100 and standard deviation 12. Simplified index ZSIH was developed as a sum of IPH, IRH and IDH; its correlation with SIH was r=0.992. If IPH is used, the values of secondary functional traits decrease. The use of IDH, IOH and IFH results in a decrease of milk performance. Selection differences were tested in a sample of bulls. The production index was compared with production indexes used in other countries. Correlations between production indexes were higher than 0.790.
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