Efficient utilization of dietary protein is affected by many factors including the animal’s physiological requirements for amino acids, genetic potential for protein deposition, digestion/absorption of dietary amino acids, use of antibiotics, and metabolism/partitioning of absorbed amino acids. Although other factors are equally important for protein utilization efficiency, this presentation will highlight the roles of immune and stress responses of pigs on protein utilization efficiency as pigs in commercial production system are exposed to considerable environmental stressors that alter the way pigs partition the absorbed nutrients. Emphasis will be given to the currently available nutritional strategies to achieve more efficient protein utilization under such environmental stress.
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