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(a) Decline in total protein (or nitrogen-containing components) and each amino acid group and non-protein nitrogen components by stage of lactation. (b) Relative contributions of individual amino acid groups and non-protein-containing components to total protein content by stage of lactation. BCAA, branched-chain amino acids; Other Ess AA, other essential amino acids; Non Ess AA, non-essential amino acids; NPN Cmpnt, non-protein nitrogen components.
