Digestion
Ileal Digesta
Digestible Indispensable Amino Acid Score (DIAAS)
Dual Isotope Tracer Method
Net Protein Utilization (NPU)*
Biological Value (BV)*
Protein Efficiency Ratio (PER)
Net Protein Retention (NPR)
Protein Digestibility Corrected Amino Acid Score (PDCAAS)
Faeces
Blood
Urine
Body Weight
Metabolism
*combinations of faeces & urine
Source: Nutrients 2022, 14, 947 7 of 31
Net Protein Utilization (NPU)*
Biological Value (BV)*