The document discusses creatine metabolism and supplementation. It summarizes that creatine plays a critical role in cellular energy balance by buffering ATP levels. The creatine-phosphocreatine system works to counter ATP shortage and formation of free radicals. Supplementing animals' diets with creatine (GAA) leads to increased performance outcomes like breast meat yield, body weight gain, and improved feed conversion ratio. Studies in poultry, pigs, and their offspring show supplementation can spare dietary energy and amino acids while maintaining or improving production metrics.