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Table 9 Blood plasma biochemical parameters of growing barrows (25 to 42 kg body weight) fed different levels of threonine (70%, 85%, 100%, 115%, and 130% of the ideal threonine:lysine ratio of 0.65) in an individual precision-feeding (IPF) system or a group phase-feeding (GPF) system

From: Pigs receiving daily tailored diets using precision-feeding techniques have different threonine requirements than pigs fed in conventional phase-feeding systems

Parameter IPF GPF   P-value2
70 85 100 115 130 70 85 100 115 130 MSE1 L FS L × FS
Number of observations 10 8 11 10 10 11 10 11 11 11     
Urea, μmol/L 2.70 1.98 2.38 2.19 2.77 2.74 2.04 2.34 2.07 2.40 0.23 < 0.01 0.51 0.83
Albumin, g/L 27.80 26.56 32.12 31.59 33.51 29.50 31.44 32.25 31.63 31.19 1.25 < 0.01 0.19 0.03
Creatinine, μmol/L 116.85 114.69 112.68 110.85 117.50 117.50 116.91 115.35 112.41 119.41 3.69 0.25 0.39 1.00
Lactic acid dehydrogenase, U/L 585.34 581.88 535.13 532.60 570.35 524.96 485.73 537.90 468.60 557.14 47.66 0.53 0.06 0.72
Total protein, g/L 62.65 64.26 65.33 66.90 67.48 61.86 65.56 64.37 66.00 66.13 1.52 0.01 0.52 0.89
Aspartate aminotransferase, U/L 36.75 44.96 38.35 43.80 43.09 36.89 37.50 36.60 36.48 44.21 3.50 0.08 0.08 0.34
Alanine aminotransferase, U/L 47.50 40.79 39.73 40.00 38.39 41.14 45.05 44.37 36.06 43.90 3.03 0.14 0.60 0.04a,b
Creatine kinase, U/L 1083 1561 1227 1822 1918 1108 1244 1562 1015 2172 412 0.15 0.67 0.52
Immunoglobulin G, μg/mL 11.29 11.28 9.93 11.90 10.98 9.71 10.90 9.48 11.31 11.36 1.18 0.19 0.33 0.84
C-reactive protein, μg/mL 9.25 13.02 9.98 18.35 24.78 13.88 15.81 18.46 22.82 12.68 3.56 0.05 0.26 0.01a,c
  1. 1MSE, maximum standard error
  2. 2L, level of threonine; FS, feeding system; L × FS, interaction between level of threonine and feeding system; linear effect for L; quadratic effect for L; alinear effect within IPF; bcubic effect within GPF; cquadratic effect within GPF