Dietary factors influencing nitrogen balance

It is the purpose of this paper to provide, in so far as it is possible, an integrated view of the interrelationships between nutrients as they affect nitrogen balance.The literature abounds with data described in qualitative terms and an attempt has been made here to fit them into a unified scheme.I n doing so we may have been guilty of oversimplification, but such generalizations are valuable in that they can lead to the quantitative solution of practical nutritional problems, for example that of (I) the best utilization of limited supplies of foodstuffs to meet the needs of the vulnerable groups of a population which has a low purchasing power, or (2) that of the design of least-cost diets for animal production, particularly for pigs and poultry. List of terms usedAB=nitrogen balance in mgiday body-weight I=nitrogen intake in mg/day kg0*73 body-weight=o-qPC @=net protein utilization (NPU) expressed as a fraction M=nitrogen used for maintenance=250 mg N/day kg0-73 body-weight S=protein score expressed as a fraction k=constant=o*o~g P=protein calories as yo of total calories C= calorie intake in kcal/day kg0*73 body-weight Cs=energy for basal metabolism=70 kcallday kgO*73 body-weight