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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).