Prediction of beef grades by means of the bioelectrical impedance analysis (BIA) [German]

摘要

The objective of the experiment was to determine the precision of the prediction of the EU grades (conformation and fatness) of beef carcasses by means of the bioelectrical impedance analysis (BIA). The method was applied on 441 carcasses (all categories) using an automatic measuring system with flat elastic electrodes with the surface area of 30 cm 2 located on the outside of the left half-carcass. The resistance and reactance at two frequencies, i.e. 1 kHz and 1.00 kHz were registered. A number of impedance values reveal significant correlations to the conformation of the carcass. Among all evaluated categories, the strongest correlation (r=0.86) was found between conformation and the value D2/Xcp100k (relationship between the square of the distance between electrodes and the calculated parallel reactance at 100 kHz). Significant relations were also identified for the fatness, particularly in the females. The highest correlations were found in values derived from the calculated parallel reactance Xcp1k, measured at the frequency of I kHz. The calculated formulae for the prediction of conformation show a considerable high positive index of determination of R-2=0.85 for all categories. The formula for the prediction of fatness shows a satisfactory (R-2=0.70 in the female categories).