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ABSOLUTELY NOT TRUE.
According to my prof. at University of Guelph Animal & Poultry Science dept.....
"Tenderness is directly related to aging. Poultry meat needs to age for at least four hours before it is eaten or frozen, or it will be tough. This is because of rigor mortisa temporary tougheningwhich is part of the process of muscle death, the natural biochemical process that converts the muscle to meat. Although the bird is dead, there is still energy in the muscle. The muscle cells continue metabolizing until this energy is used up, switching from aerobic metabolism to the less efficient anaerobic (without oxygen). Rigor mortis does not set in immediately after slaughter, but gradually as the muscles deplete their energy stores. "Cross bridges" form within the muscle structure, and the muscle cannot be extended. After a while, the muscle structure starts breaking down and the muscle becomes flexible again.
Rigor mortis is relatively brief in poultry; it is largely complete in 4 hours in chickens (6 to 8 hours in turkeys). Rigor is not fully complete for 24 hours, but tenderness only increases marginally after the initial 4 hours."