engleski

Bioelectric Impedance: Simpler Approach to Prediction of the Meat Yield in the Pig Halves

Development of the phase – sensitive electric devices enabled routine two – electrode measurement of electric impedance for the determination of PSE pork meat (Pfutzner et al., 1981, Feldhussen et al., 1987, etc.) and four – electrode measurement of impedance for the prediction of fat-free mass in the various species of domestic animals and their carcasses (Swantek et al., 1992, Berg and Marchello, 1994, etc.) Our long-lasting two-electrode researches have shown successfulness in the determination of PSE meat and composition of some muscles in the different animal species and their carcasses (Bego et al., 1995-1998). In this paper we investigated the possibility of usage of the method of bioelectric impedance in the prediction of percentage and mass of muscle tissue in the halves of Hypor lines fattened pigs (n=40) with the average carcass weight 76, 79 kg, length 97, 8 cm, back fat thickness 13 mm, muscle thickness 61, 86 mm (masured using the Two Point method) and pH45 value 6, 01. Measurement of the impedance module were done using HPRLC – Meter – 4284 A impedance analyzer at the frequencies of 15, 50, 100 and 200 kHz. Two electrodes were pointed into m. gracilis 8 cm ventral of pelvic symphisis. Multifrequency analyses showed that the data obtained at 200 kHz frequency are the most reliable. That frequency is the most suitable for the measurement of meat yield in the pig halves when using recalculated values of impedance, weight and length o the halves. Linear regression analysis shown exceptional accordance between the meat yield data obtained by the Two Point method and recalculated impedance measurements in m. gracilis and the weight (R2=0.943, RSD=0.91) and length (R2=0.951, RSD=0.83) of pig halves. Based on this research, we can conclude that two – electrode measurement of the impedance, done on m. gracilis at the frequency of 200 kHz with the recalculated values of weight and length of the halves, gives the reliable picture of the meat yield in the pig halves.

Bioelectric impedance ; The meat yield ; Carcass length ; Back fat thickness

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