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Table 1 Allometric analysis of reduced major axis regressions

From: Differences in hindlimb morphology of ducks and chickens: effects of domestication and selection

 

Expected slope

Slope

Lower CI

Upper CI

R2

Tibiotarsal length

Broiler

0.33

0.40 (+)

0.37

0.44

0.93

Layer

0.33

0.43 (+)

0.41

0.46

0.98

Pekin hybrid

0.33

0.17 (−)

0.15

0.20

0.78

Pekin male line

0.33

0.15 (−)

0.13

0.18

0.84

Pekin female line

0.33

0.17 (−)

0.15

0.20

0.82

Mallard

0.33

0.21 (−)

0.18

0.23

0.88

Femoral length

Broiler

0.33

0.33 (=)

0.30

0.35

0.95

Layer

0.33

0.41 (+)

0.38

0.44

0.97

Pekin hybrid

0.33

0.23 (−)

0.20

0.26

0.85

Pekin male line

0.33

0.22 (−)

0.20

0.24

0.93

Pekin female line

0.33

0.21 (−)

0.18

0.23

0.88

Mallard

0.33

0.24 (−)

0.21

0.26

0.91

Leg muscle mass

Broiler

1

1.15 (+)

1.09

1.21

0.98

Layer

1

1.41 (+)

1.34

1.48

0.98

Pekin hybrid

1

0.70 (−)

0.62

0.80

0.86

Pekin male line

1

0.64 (−)

0.58

0.71

0.91

Pekin female line

1

0.59 (−)

0.53

0.66

0.90

Mallard

1

0.59 (−)

0.48

0.72

0.68

Tibiotarsal torsion

Broiler

0

−0.08

−0.11

−0.06

0.10*

Layer

0

0.05

0.03

0.07

0.00*

Pekin hybrid

0

−0.21

−0.28

−0.15

0.22

Pekin male line

0

−0.13

−0.17

−0.10

0.35

Pekin female line

0

−0.12

−0.15

−0.09

0.44

Mallard

0

−0.19

−0.25

−0.15

0.43

Femoral torsion

Broiler

0

0.09

0.07

0.13

0.01*

Layer

0

−0.07

−0.10

−0.05

0.02*

Pekin hybrid

0

−0.17

−0.22

−0.13

0.52

Pekin male line

0

−0.11

−0.14

−0.09

0.59

Pekin female line

0

−0.10

−0.13

−0.08

0.47

Mallard

0

−0.11

−0.15

−0.08

0.24

Tibiotarsal cortical area

Broiler

0.67

0.81 (+)

0.68

0.96

0.75

Layer

0.67

0.77 (+)

0.67

0.88

0.86

Pekin hybrid

0.67

0.60 (=)

0.49

0.74

0.66

Pekin male line

0.67

0.34 (−)

0.29

0.41

0.74

Pekin female line

0.67

0.31 (−)

0.26

0.37

0.86

Mallard

0.67

0.48 (−)

0.41

0.55

0.80

Femoral cortical area

Broiler

0.67

0.68 (=)

0.57

0.81

0.75

Layer

0.67

0.80 (+)

0.71

0.90

0.89

Pekin hybrid

0.67

0.47 (−)

0.35

0.64

0.24

Pekin male line

0.67

0.19 (−)

0.14

0.27

0.02*

Pekin female line

0.67

0.21 (−)

0.15

0.29

0.07*

Mallard

0.67

0.35 (−)

0.28

0.45

0.53

Tibiotarsal stiffness

Broiler

0.67

0.63 (=)

0.54

0.73

0.81

Layer

0.67

1.28 (+)

1.14

1.43

0.90

Pekin hybrid

0.67

0.79 (=)

0.66

0.95

0.73

Pekin male line

0.67

0.78 (=)

0.67

0.90

0.81

Pekin female line

0.67

0.77 (=)

0.66

0.90

0.81

Mallard

0.67

0.79 (=)

0.62

1.00

0.52

Tibiotarsal maximum load

Broiler

0.67

0.78 (+)

0.68

0.89

0.85

Layer

0.67

1.13 (+)

0.99

1.27

0.88

Pekin hybrid

0.67

1.01 (+)

0.89

1.15

0.86

Pekin male line

0.67

0.67 (=)

0.59

0.76

0.87

Pekin female line

0.67

0.74 (=)

0.65

0.84

0.88

Mallard

0.67

0.88 (+)

0.79

0.99

0.89

  1. Slopes and R2 values for various bone traits are provided, along with their 95 % confidence intervals. Regressions presented here were significant (P < 0.01) with the exception of those marked *. All length measurements that are regressed against body mass have an expected slope of 0.33 and measurements of areas have an expected slope of 0.67. Angular measurements such as torsion are expected to have a slope of 0. The symbols next to each slope indicate positive allometry (+), negative allometry (−) or isometry (=)
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Genetics Selection Evolution

ISSN: 1297-9686