ZBMQ.htm

NR ZBMQ

AU Thiemig,F.; Oelker,P.

TI The influence of the reflective muscle movements of stunned pigs on the ultrastructure of the longissimus dorsi muscle

OT Einfluss von Muskelreflexen betäubter Schweine auf die Ultrastruktur der Skelettmuskulatur

QU Fleischwirtschaft 2000; 80: 97-101

PT journal article

AB THIEMIG and OELKER (1) reported of an electrical post-stunning of clonically cramped pigs during bleeding, which immobilises the animals for slaughter, thus reducing the proportion of PSE. In order to broaden this research, tissue examinations of chop samples, which were used in those studies, for possible ultrastructural damage were carried out, depending on the strain categories: 1. during bleeding of heavily cramped slaughter bodies; 2. absolutely calm hanging slaughter bodies; 3. slaughter bodies, which will be treated with additional electrical stunning after the beginning of the cramp. In this examination, muscular tissue samples of the chops were treated with a method, developed by THIEMIG and OELKER (5, 6), to determine the effect of gaping with the vacuum - freeze - drying unit,,Alpha 1-4" by Martin Christ GmbH, Osterode. During this modified vacuum - freeze - drying treatment more or less big gaping effects could be found, depending on the mechanically caused pre - damage of the muscular tissue. The biggest gaps appeared in the heavily cramped samples. Only small gaps appeared in the non-cramped samples. Medium gaps appeared in the samples which had been treated with additional stunning. However, these loosenings often were far more discreet, so that visually they were hardly recognisable. In order to find out the causes of these results, examinations of the microstructure were done with a scanning electron microscope. A large number of small gaps between the myofibrils could be made visible with a 300 times magnification of diagonally cut muscle fibres. These,,microgaps" were not or to a less extent found in the samples of non-cramped pigs. In the samples of additionally stunned pigs mostly a few but relatively big gaps within the muscular tissue cross-sections were visible. These microgaps within the muscle fibres are partially responsible for the heavy outflow of meat juice of PSE meat. The described ultrastructural results corroborate the previous results of the PSE-reducing effect of a suggested additional electrical stunning for slaughter pigs. This post- stunning is applied when the slaughter pigs, during bleeding, enter clonic cramps.

AD Thiemig,F.; Tech Univ Berlin, Fak 3, Fachgebiet Technol Prot Reicher Lebensmittel, Invalidenstr 42, D-10115 Berlin, Germany

SP deutsch

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