INFLUENCE OF BOARS PERFORMANCE-TEST ON TH EIR OFFSPRING FATTENING PARAMETERS IMPROVEMENT

In the present paper various methods of individual performance test we re evaluated in boars of the White Meaty breed (from 30 to 80 kg; from 30 to 100 kg). The highest number of boars (n = 115) was evaluated in 60-day performance test which was conducted from the live weight of 3 0 kg. Daily weight gain of 1 300 g and feed conversion (feed intake pe r 1 kg weight gain) amounting to 2.10 kg were best results in this tes t. The daily weight gain and feed conversion were better in the 60-day test (947 g and 2.70 kg) than in the test performed for the live weig ht interval 30 to 80 kg (893 g and 2.78 kg) despite the fact that the test from 30 to 80 kg of live weight took almost the same time interva l (57.7 days). The reason was that the 60-day test followed a strict s election of boars included in the test on the basis of the results of their parents obtained at a progeny testing station. The results of in vestigation confirmed that the offspring of the boars included in the individual performance test after the parents with very good parameter s at a progeny testing station had the statistically significantly (P less than or equal to 0.01) better results (daily weight gain 941 g an d feed conversion 2.61 kg) than the offspring, the parents of which we re not tested at a progeny testing station or they had worse results ( 839 g and 2.96 kg). The trials performed until now to evaluate the eff ect of boars selected on the basis of individual performance test indi cated that the offspring after these boars had on average by 5% better parameters of performance in fattening under normal husbandry conditi ons and in test fattening than the offspring after unselected boars. B esides it was found out that the breeding gilts after a sire with exce llent parameters in performance test (daily weight gain 933 g and feed conversion 2.42 kg) had the statistically significantly (P less than or equal to 0.01) higher daily weight gain from birth to the live weig ht 100 kg (538 g) and the lower backfat thickness (1.67 cm) in compari son with the gilts after unselected boar lines (518 g and 1.82 cm). Th e capability of the performance of selected boars was reflected in the ir offspring in feed conversion at 78% and in daily weight gain at 77% . A total of 32 breeding boars with feed conversion parameter 2.7 kg a nd less were included in elite herds of the White Meaty breed as a res ult of selection on the basis of individual performance tests performe d until now.