Selection index for bulls of Holstein cattle in the Czech Republic
Pribyl, J.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic))E-mail:[email protected] | Safus, P.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Stipkova, M.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Stadnik, L.(Ceska Zemedelska Univ., Prague (Czech Republic)) | Cermak, V.(Ceskomoravsky Svaz Chovatelu, Hradistko pod Mednikem (Czech Republic))
Complex selection indexes combining partial breeding values for milk performance, fertility and body conformation are proposed for bulls of Holstein cattle in the Czech Republic. Conformation is expressed either by linear classification or by general characteristics and body measurements. Different variants of selection indexes were tested. The breeding objective included either all or only some of the traits. Production traits and linear classification of body conformation, or production traits and general characteristics of body conformation, or production traits and general characteristics of body conformation and body measurements were used as a source of information (in performance recording). A reduced selection index which did not include milkability, health and meat performance and where production traits and linear classification of body conformation were employed as a source of information has been chosen. This index guarantees 69.30% reliability of breeding value estimation. The importance of milk performance, reproduction and linear body classification as sources of information in the index are 79.61%, 15.52% and 4.86%, respectively.
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