EXPECTED RESULT OF THE SELECTION OF CZECH PIED CATTLE

Prediction of expected result of selection and its comparison with an actual result serve for organization and making more effective the sel ection process. In 1995 the Czech Pied cattle represented 55% of cows bred in the Czech Republic. The structure of selection programme and i ntensity (Tab. I) are similar in the other cattle breeds with dual-pur pose production. The total genotype is defined by indicators of milk a nd meat production and secondary functional characters (Tab. IV). Base d on the breeding values of different categories of cattle in studied characters (Tab. III) the breeding value for complex of all traits in the total genotype (Tab. VIII) is estimated. In estimation of total ef fect the correlations between breeding values (Tabs. V, VI) and reliab ility of breeding values for partial characters (Tab. VII) are conside red. Using breeding values of partial characters in different categori es of animals and age structure (Tab. II) an expected partial annual s election result (Tab. IX), which amounts to 96.3 Kc, is determined. In total milk production participates in the total selection result by 9 2.4%, meat production by 1.6% and 6% by secondary functional character s (Tab. X). Higher effect (Tab. XI) is achieved in simulation of the s ame selection programme using selection indices and all available info rmation in estimation of the breeding value. The ratio 81% : 20% (Tab. XII) would be used in selection in this case for milk and meat. Econo mic optimization studies are needed to make the breeding more efficien t and for co-ordination of the selection effort into the groups of dif ferent characters.