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Table 4 Effects of stocking density and tryptophan (TRP) level on plasma parameters of broilers1

From: Effects of dietary tryptophan and stocking density on the performance, meat quality, and metabolic status of broilers

Stocking density, birds/m2 Tryptophan Concentration, % LDH2, U/L GLU, mg/dL TG, mg/dL TC, mg/dL GPT, U/L GOT, U/L
Stocking density ×  tryptophan level
11.0 0.18 24,219ab 239.1b 39.49 106.1 2.88b 32.92
11.0 0.27 22,317b 228.2b 51.48 121.2 3.83b 31.95
15.4 0.18 28,028a 232.6b 48.30 104.8 9.10a 32.60
15.4 0.27 19,695b 256.9a 58.97 121.2 5.05b 32.33
SEM   5,106.0 16.66 17.956 16.67 2.595 4.575
Stocking density      
11.0 23,268 233.6 45.49 113.6 3.36 32.43
15.4 23,861 244.8 53.63 113.0 7.08 32.47
SEM 1,042.3 3.40 3.665 3.40 0.529 0.934
TRP level       
0.18% 26,123 235.9 43.89 105.4 5.99 32.76
0.27% 21,006 242.5 55.23 121.2 4.44 32.14
SEM 1,042.3 3.40 3.665 3.40 0.529 0.934
P value
Stocking density   0.742 0.053 0.272 0.925 <0.001 0.987
TRP level   0.009 0.232 0.132 0.023 0.001 0.761
Density × TRP 0.024 0.004 0.928 0.925 <0.001 0.863
  1. 1Each mean represents 8 birds for each treatment.
  2. 2LDH: lactic dehydrogenase; GPT: glutamic-pyruvic transaminase; GOT: glutamic-oxalacetic transaminase; GLU: glucose; TG: triglyceride; TC: total cholesterol.
  3. a,bMeans in the same row with different superscripts are significantly different (P < 0.05).