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Table 10 Predicted egg quality traits for the four genetic groups and estimates of heterosis for the two reciprocal crosses

From: Genetic parameters, reciprocal cross differences, and age-related heterosis of egg-laying performance in chickens

Trait

Genetic group

H% (WY)

H% (YW)

Reciprocal cross differences (%)

WW

YY

WY

YW

ESI32

75.09

78.02

76.04

76.21

− 0.7*

− 0.4

− 0.2

ESC32

79.25

46.68

68.11

66.49

8.2**

5.6**

2.6

ESS32

3.29

3.95

3.80

4.00

4.8**

10.3**

− 5.5

EST32

0.33

0.33

0.34

0.34

0.8

2.7**

− 1.9

ESR32

9.63

10.07

9.97

10.10

1.2

2.5**

− 1.3

YR32

26.56

30.64

29.16

29.22

1.9**

2.2**

− 0.2

YC32

5.68

6.06

6.14

5.78

4.6**

− 1.5

6.1

HU32

69.48

66.66

66.24

65.79

− 2.7**

− 3.3**

0.6

ESI54

73.36

74.28

73.42

73.36

− 0.5

− 0.6

0.1

ESC54

78.68

49.06

68.89

66.38

7.9**

3.9**

3.9

ESS54

3.08

3.75

3.44

3.84

0.9

12.6**

− 11.7*

EST54

0.33

0.33

0.33

0.35

0.6

4.7**

− 4.1

ESR54

9.00

9.36

9.22

9.45

0.5

2.9**

− 2.4

YR54

28.21

32.24

30.65

30.81

1.4*

1.9**

− 0.5

YC54

4.30

5.07

4.77

4.66

1.9

− 0.4

2.3

HU54

78.60

74.86

73.68

74.56

− 4.0**

− 2.8**

− 1.2

ESI72

72.79

73.60

73.18

73.13

− 0.01

− 0.1

0.1

ESC72

73.67

45.33

63.55

62.84

6.8**

5.6**

1.2

ESS72

2.92

3.63

3.39

3.65

3.6

11.4**

− 7.8

EST72

0.31

0.31

0.32

0.33

4.1**

6.6**

− 2.4

ESR72

8.80

9.06

9.16

9.28

2.6**

3.9**

− 1.3

YR72

28.61

32.70

30.64

30.88

− 0.04

0.7

− 0.8

YC72

6.31

7.29

6.72

6.76

− 1.2

− 0.6

− 0.6

HU72

76.25

73.76

70.78

72.90

− 5.6**

− 2.8

− 2.8

ESI86

72.23

72.62

72.72

72.89

0.4

0.6

− 0.2

ESC86

69.28

44.75

62.42

60.98

9.5**

7.0**

2.5

ESS86

2.78

3.47

3.19

3.32

2.2

6.3*

− 4.1

EST86

0.33

0.33

0.34

0.35

3.3**

5.9**

− 2.6

ESR86

8.50

8.74

8.81

8.93

2.2*

3.6**

− 1.4

YR86

29.07

32.64

30.76

31.21

− 0.3

1.1

− 1.4

YC86

5.97

6.95

6.13

6.34

− 5.1

− 1.8

− 3.3

HU86

70.53

69.49

63.91

66.51

− 8.7**

− 5.0**

− 3.7

ESI100

72.67

73.33

72.74

72.40

− 0.4

− 0.8

0.5

ESC100

66.24

41.33

58.95

57.37

9.6**

6.7**

2.9

ESS100

2.71

3.05

2.97

2.91

3.0

1.1

2.0

EST100

0.30

0.29

0.29

0.30

0.2

4.2**

− 4.0

ESR100

7.89

8.04

8.12

8.04

1.9

1.0

1.0

YR100

28.57

32.05

30.80

30.99

1.6

2.2*

− 0.6

YC100

5.17

6.41

5.84

6.15

0.7

6.1

− 5.4

HU100

68.16

67.66

61.25

64.49

− 9.8**

− 5.0**

− 4.8

  1. H% (WY): percent heterosis for WY, the percentage of performance of WY being better than the average performance of the two parental lines, H% (YW): percent heterosis for YW, the percentage of performance of YW being better than the average performance of the two parental lines
  2. Wald F statistics after adjusting with multiple testing for H% (WY), H% (YW), and reciprocal cross differences was indicated as follows *FDR ≤ 0.05, **FDR ≤ 0.01
  3. YY Beijing-You chickens, WW White Leghorn chickens, WY offspring of a cross between White Leghorn as the sire line and Beijing-You as the dam line, YW offspring of a cross between Beijing-You as the sire line and White Leghorn as the dam line, ESIX egg shape index at X weeks of age, ESCX eggshell colour at X weeks of age, ESSX eggshell strength at X weeks of age, ESTX eggshell thickness at X weeks of age, ESRX eggshell ratio at X weeks of age, YRX yolk ratio at X weeks of age, YCX yolk colour at X weeks of age, HUX Haugh unit at X weeks of age
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Genetics Selection Evolution

ISSN: 1297-9686