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Summary 1. Proteins are an essential nutrient required for the proper nutrition of all animals. 2. The animal kingdom is dependent on the plant kingdom for the major portion of the protein. 3. The ruminants are not as specific in their protein requirements as the animals with small stomachs. 4. Proteins for monogastric animals are sources of undefined nutrients along with certain amino acids. 5. Biological value of proteins is an expression of the nutritional value of a protein for animals with small stomachs. 6. More information is required on the nutrients or compounds furnished by proteins of high biological value. 7. The animal proteins required to supplement vegetable proteins are available in insufficient quantities for the adequate nutrition of swine and poultry. 8. Better methods are needed for the proper evaluation of proteins.

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