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Table 2 Limitation order of essential amino acids in low protein diets

From: Effect of different dietary protein levels and amino acids supplementation patterns on growth performance, carcass characteristics and nitrogen excretion in growing-finishing pigs

Item 25–50 kg phase 50–75 kg phase 75–100 kg phase 100–125 kg phase
First limiting AA Lys (54.74 %) Lys (51.57 %) Lys (46.67 %) Lys (44.49 %)
Second limiting AA Met (64.77 %) Thr (64.80 %) Thr (61.26 %) Thr (60.70 %)
Third limiting AA Thr (66.52 %) Trp (68.14 %) Trp (64.29 %) Trp (62.56 %)
Fourth limiting AA Trp (71.04 %) Met (68.21 %) Met (69.56 %) Ile (72.29 %)
Fifth limiting AA Val (78.76 %) Ile (76.16 %) Ile (76.17 %) Met (73.81 %)
Sixth limiting AA Ile (79.27 %) Val (81.07 %) Val (80.73 %) Val (83.20 %)
Seventh limiting AA His (92.59 %) His (96.95 %) Phe (96.39 %)  
Eighth limiting AA Phe (96.49 %) Phe (97.38 %) His (98.97 %)  
  1. The percentages in parentheses represent the ratio of the amino acids content in the low protein diet(−4%) without addition of synthetic amino acids) to the NRC (2012)