Abstract
Abstract PRE-MORTEM injection of epinephrine into chickens results in muscle that is tender when cooked immediately after slaughter, with out the aging period of six to twelve hours required for normal muscle (de Fremery and Pool, 1960a, 1962). The epinephrine treatment also brings about an essential exhaustion of the normal supply of muscle glycogen. Normally, glycogen is degraded to lactic acid by a series of cyclic anaerobic reactions which, in their intermediate steps, maintain a high level of adenosine triphosphate (ATP) for several hours post mortem. Consequently the post-mortem ATP level drops rapidly in the epinephrine-treated muscle but only a small decrease in pH occurs. This paper reports the time course of the changes in extensibility and length of muscles from epinephrine-treated chickens. Equipment for measuring extensibility and length of strips of pectoralis major muscle under periodic loading was derived from that of Bate-Smith (1939) and Bate-Smith and Bendall (1949). Linear…
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