Table 3 Effects of dietary methionine level on carcass traits of Pekin ducks at 42 days of age.

0.28

86.8±1.0

1663±105^b

57.9±2.2^b

32.2±10.6^a

1.46±0.48^a

514.0±94.5

25.0±3.7^a

0.35

87.0±1.6

1712±115^b

59.1±1.6^b

26.6±5.9^b

1.19±0.26^b

492.1±46.4

23.5±1.4^a,b

0.43

86.8±0.9

1858±142^a

60.9±1.8^a

20.3±2.8^c

0.86±0.11^c

489.9±37.6

21.8±1.7^b

0.50

87.5±1.0

1777±177^a,b

61.8±1.6^a

20.1±5.6^c

0.89±0.21^c

454.6±81.9

21.6±1.2^b

0.58

87.2±1.0

1775±129^a,b

60.8±1.5^a

20.1±5.8^c

0.85±0.21^c

473.8±66.2

21.6±2.1^b

 Met

0.492

0.013

<0.001

<0.001

<0.001

0.301

0.001

 Met linear response

0.026

<0.001

<0.001

<0.001

<0.001

 Met quadratic response

0.032

0.007

0.019

0.011

0.071