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The aim of this study was to test accuracy of measurements done by Falco 100 (PieMedical) ultrasonic equipment. 10 Angus, 10 Hungarian Simmental, 10 Limousin and10 Charolais fattening bulls were measured at the feedlot just before slaughtering. Fatthickness at the rump (P8) and ribeye area (REA) were realized from each animal. Afterslaughtering, the data of slaughter and carcass weights were collected and carcasseswere judged on the base of EUROP system. The database was examined by SPSS 9.0 forWindows. Average liveweight of Angus was 645 ± 41.5 kg, of Hungarian Simmental was676 ± 41.8 kg, of Limousin was 655 ± 50.8 kg and of Charolais was 694 ± 42.3 kg at themeasurement. REA measured with ultrasound was 102.9 ± 8.9 cm2, 102.7 ± 10.4 cm2,111.2 ± 9.6 cm2 and 106.4 ± 9.5 cm2, respectively. P8 was 1.05 ± 0.28 cm, 0.62 ± 0.13 cm,0.62 ± 0.09 and 0.61 ± 0.18 cm, respectively. Correlation between ultrasonic and carcassREA in case of mentioned breeds was 0.74, 0.74, 0.94 and 0.80. Correlation between P8and EUROP fat score was 0.51, 0.73, 0.56 and 0.28, respectively. Overall correlationbetween ultrasonic and carcass REA was 0.83 (P≤0.01), and between P8 and EUROP fatscore was 0.69 (P≤0.01)

Correlation of ultrasonic measured ribeye area and fat thickness to the certain traits measured on slaughtered bulls (Short Communication)