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Amino acid requirements and protein digestibility and assessment in dogs with considerations for cats
Dietary protein remains a key focus for petfood manufacturers; however, few properly designed amino acid (AA) requirement studies have been conducted in adult dogs. Data examining the effects of dietary protein in dogs exist, but few studies provide an understanding of the dietary AA provided or the digestibility and metabolic availability of those AA when different ingredients are utilized. Furthermore, there is a derth of data on the effects of different food processing parameters on AA bioavailability in dogs. Effects of processing are important as new regulatory requirements for food safety have been implemented. Previous estimates of AA requirements used chemically defined diets and long adaptation periods and may have resulted in AA requirements that are lower than what is required to support protein synthesis. Carbon oxidation approaches have been developed to measure AA requirements of dogs using more appropriate adaptation periods and common ingredients. In addition, secondary measures of AA adequacy, such as taurine status and immune function, also should be investigated to further optimize dietary approaches for dogs. Greater knowledge of AA requirements will lead to better overall protein quality in commercial dog food and provide a better basis for formulation of diets for canine clinical cases.
Keywords: amino acid, requirements, protein, dogs, digestbility, metabolic availability