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are the so-called non-essential amino acids which do not need to be present in the diet. others are essential and need to be part of the pet food: for dogs there are 10 essential amino acids, for cats there are 11. proteins are the building blocks of organs, muscles, bones, blood, immune system and hair
and nails. proteins in pet food can come from various different ingredients, both from animal and vegetable origin like poultry, beef, pork, fish, eggs, corn, rice, peas or soybeans. it's important that the pet eats the right amount of proteins and that the protein can be easily digested and absorbed...
http://www.fediaf.org/39-prepared-pet-foods/86-nutritional-needs-of-cats-and-dogs.html