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Table 4 The concentrations of free amino acids in the plasma of finishing pigs fed three levels of dietary lysine1

From: Effects of dietary lysine levels on plasma free amino acid profile in late-stage finishing pigs

Amino acids (nmol/mL)2 Treatment group SE3 P value4
Diet I Diet II Diet III
Lysine 91.0a 317.6b 501.4c 42.5 <0.0001
Total EAA 1132.4b 861.6a 840.7a 44.5 0.0009
Leucine 179.4a 195.9a,b 200.1b 6.32 0.081
Histidine 124.1b 89.4a 88.3a 8.21 0.011
Phenylalanine 106.4b 56.6a 58.2a 11.3 0.010
Isoleucine 108.4b 77.1a 77.9a 5.32 0.001
Threonine 258.4b 149.7a 138.8a 11.2 <0.0001
Valine 209.1b 142.8a 144.6a 10.1 0.0004
Methionine 64.4 59.7 58.3 3.03 0.352
Tryptophan 82.1 90.2 74.6 6.12 0.231
Total NEAA 2929.5a 3444.0b 3325.5b 107.3 0.013
Arginine 228.1b 185.5a 159.6a 13.3 0.008
Citrulline 102.2b 76.3a 63.1a 6.69 0.003
Alanine 400.9a 509.1b 509.8b 31.9 0.045
Glutamate 89.5a 128.6b 106.0b 12.3 0.113
Glycine 917.4a 1324.0b 1308.4b 52.6 <0.0001
Asparagine 69.4a 78.3a 103.9b 7.98 0.021
Aspartate 17.0 18.1 18.3 1.87 0.869
β-Alanine 47.7 51.6 44.4 3.71 0.413
Cysteine, total5 193.8 203.3 199.8 4.72 0.385
Glutamine 459.4 466.5 420.8 17.3 0.166
Ornithine 110.2 93.8 108.0 8.00 0.319
Proline 286.2 290.2 284.0 5.57 0.734
Serine 190.5 235.1 233.0 24.0 0.358
Taurine 189.1 174.8 147.8 15.2 0.185
Tyrosine 108.2 102.5 102.5 4.57 0.611
Total AA 4152.9a 4623.2b 4667.6b 146.2 0.053
  1. 1Calculated total lysine contents (as-fed basis) in Diets I, II, and III were 0.43, 0.71, and 0.98 %, respectively
  2. 2EAA = essential amino acids excluding lysine, NEAA = “non-essential amino acids”, and total AA include lysine, total EAA, and total NEAA
  3. 3SE = pooled standard error of the mean, n = 6
  4. 4 P values were obtained from the ANOVA F test
  5. 5Total cysteine (cysteine + ½ cystine)
  6. a,b,cMeans within a row that do not share a same superscript differ (P < 0.05)