1. Acid Excretion “Acid excretion” is an important part of meat processing technology. It is the process of quickly cooling the carcass after slaughter to 15-16℃, and hanging it vertically in a safe environment with minimal negative losses such as bacteria, oxidation, and dry consumption, to complete the maturation of the meat and obtain the greatest economic benefits. 2. The factors that affect the rate and effect of acid excretion. Eliminating the live cattle stress response, hunger before slaughter, stunning slaughter, and correct assassination and bloodletting are all factors that ensure the smooth progress of acid excretion. Electric stunning is one of