Age (d)

Whole body weight (g)

Empty body weight2 (g)

Feather weight (g)

Feathers (% of empty body)

Female

Male

Female

Male

Female

Male

Female

Male

1

8

15

22

29

363

45.1

180

437

952

1749

2499

46.6

195

516

1045

1655

2437

42.0

154

392

866

1632

2305

43.0

170

475

964

1534

2278

1.4

2.9

9.7

28.3

53.8

83.1

1.3

4.3

16.3

35.9

62.6

91.7

3.34

1.85

2.38

3.26

3.28

3.61

2.95

2.54

3.42

3.72

4.10

4.04

Mean

990

975

910

904

30.3

35.1

2.97

3.47

ANOVA significance levels (p)

Age (A)

Gender (G)

A x G

<0.001

=0.746

=0.006

<0.001

=0.433

=0.003

<0.001

<0.001

=0.011

<0.001

<0.001

<0.001