| Popis: |
Amino acid requirements for growing and adult animals have been studied and debated for many years. Amino acid requirements typically have been expressed in proportion to dietary dry matter or dietary energy content. This chapter discusses desirable methods to express requirements on a scientific and on a practical basis. Subdividing amino acid requirements into portions for maintenance vs. growth or production forces one to consider specific functions of amino acids which leads one to question certain basic, classical concepts of protein nutrition. As maintenance is only a small fraction of the total amino acid need for certain rapidly growing animals like rats or chicks, consideration of maintenance needs for amino acids, as for energy, are relatively unimportant. For formulation of diets for animals or man, requirements are expressed most conveniently as a percentage of diet dry matter or in proportion to diet energy concentration. |
