Influence of Temperature, Fasting and Transportation
The influences of different temperatures during transport (+2°C, +12°C, +36°C), and an additional fasting period of 48 h before slaughter were investigated in relation to characteristics of meat quality and post mortem glycogenolysis in 48 young bulls of the German Simmental breed. Feeding of animals was discontinued 22 h before transportation to the slaughterhouse. The duration of transport lasted four hours and the RH in the air-conditioned truck was 65 per cent. Final pH values 48 h post mortem in M. semimembranosus, M. semitendinosus, M. longissimus dorsi, M. psoas major and M. biceps femoris were determined. Water-binding capacity (Grau/Hamm), and essential metabolites of glycogen metabolism at 45 min post mortem were also measured.
Different temperatures during transport, followed by immediate slaughter did not lead in any case to dark-cutting beef; only at the highest temperature were lower glycogen contents and higher lactate and glucose concentrations found, especially in M. semitendinosus. The additional fasting led in all muscles examined to a drastic decline in glycogen concentration, particularly in M. longissimus dorsi, M. semitendinosus and M. semimembranosus. Highly significant differences were also found in ultimate pH values and in the water-binding capacity, compared with unfasted animals. Glucose, ATP and creatine phosphate levels were almost unaffected by the experimental treatments.
KeywordsCreatine Phosphate Meat Quality Biceps Femoris High Lactate Glycogen Metabolism
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