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Table 2 Effects of stocking density and tryptophan (TRP) level on broiler performance1

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

Stocking density, birds/m2 Tryptophan Level, % Initial Bodyweight, g Final Bodyweight, g Daily bodyweight Gain, g Feed Intake, g/d Feed efficiency
Stocking density ×  tryptophan level
11.0 0.18 778 1,960 69.53 127.2 1.83b
11.0 0.27 780 1,961 69.47 126.5 1.82b
15.4 0.18 781 1,887 65.00 123.5 1.90a
15.4 0.27 781 1,939 68.06 123.2 1.81b
SEM   5.6 76.2 4.250 6.30 0.059
Stocking density
11.0   779 1,963 69.65 126.8 1.82
15.4   781 1,913 66.59 123.4 1.85
SEM   1.1 16.4 0.900 1.28 0.012
Tryptophan level
0.18%   780 1,924 67.24 125.3 1.86
0.27%   782 1,950 68.76 124.9 1.82
SEM   1.1 15.5 0.057 1.28 0.015
P-values       
Stocking density   0.351 0.084 0.089 0.214 0.144
TRP level   0.891 0.564 0.509 0.851 0.052
Density × TRP   0.659 0.265 0.375 0.938 0.045
  1. 1Each mean represents 6 replicates for each treatment with each replicate containing 5 (11.0 birds/m2) or 7 birds (15.4 birds/m2).
  2. a,bMeans in the same row with different superscripts are significantly different (P < 0.05).