ZDGZ.htm

NR ZDGZ

AU Kuenzel,W.J.; Ingling,A.L.; Denbow,D.M.; Walther,J.H.; Schaefer,M.M.

TI Variable frequency stunning and a comparison of two bleed-out time intervals for maximizing blood release in processed poultry

QU Poultry Science 1978; 57: 449-454

PT journal article

AB An electrical stunner, designed such that both frequency and voltage could be varied independently, was tested to determine which combination of voltage and frequency resulted in a stun which maximized bleed-out in broilers. Frequencies and peak voltages tested were, respectively, 30, 60, 120, 240, 480, and 960 Hertz (Hz, cycles per sec), and 50, 60, 70, 80, 90, and 100 V. The combination which resulted in best blood relese was a peak voltage of 100 V, average voltage of 30 V, and a frequency of 480 Hz. The variable frequency stunner was compared to an AC stunner (60 Hz, 50 V) for maximizing bleed-out in male broilers. No significant difference was found between the two circuits. Two bleed-out time intervals were tested using three electrical circuits: AC, DC, and variable frequency. Approximately twice as much blood was collected during the additional 30 sec time interval when the DC circuit was employed. It is suggested that processing plants using DC stunners increase bleed-out time from the standard 60 sec to at least 90 sec before the broilers enter a scalder. The electrical cost of operating three electrical circuits for stunning poultry was evaluated. The AC circut (60Hz) was most efficient and the DC circuit least efficient in terms of electrical energy used to stun a given broiler. The variable frequency stunner ranked second.

SP englisch

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