Age (d)

Empty body mass2 (g)

Crude protein (%) in

Crude ash (%) in

Feathers

Feather-free body2

Feathers

Feather-free body2

m

f

m

f

m

f

m

f

m

f

1

42

43

15.2

12.7

84.8

87.3

1.4

1.2

98.6

98.8

8

146

169

6.7

7.0

93.3

93.0

0.9

1.1

99.1

98.9

15

392

475

5.3

7.8

94.7

92.2

1.2

1.3

98.8

98.7

22

872

964

7.3

8.4

92.7

91.6

1.2

1.2

98.8

98.8

29

1634

1534

7.9

10.3

92.1

89.7

1.1

1.2

98.9

98.8

363

2297

2279

9.4

12.3

90.6

87.7

1.1

1.4

98.9

98.6

Mean

1004

1019

8.7

9.8

91.3

90.2

1.1

1.2

98.8

98.8

SD

839

799

3.4

2.3

3.4

2.3

0.2

0.1

0.2

0.1

Significance levels (p) of two-way ANOVA

A

<0.001

<0.001

<0.001

=0.001

=0.001

G

=0.746

<0.001

<0.001

=0.012

=0.012

A × G

=0.006

<0.001

<0.001

=0.005

=0.005