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Table 3 Estimates of variance components and heritabilities for growth and feed efficiency traits using genomic and pedigree relationship matrices

From: Identification of QTL regions and candidate genes for growth and feed efficiency in broilers

Traits

Matrixb

Parametersc

\({\upsigma }_{\mathrm{a}}^{2}\)

\({\upsigma }_{\mathrm{m}}^{2}\)

\({\sigma }_{\mathrm{am}}\)

\({\upsigma }_{\mathrm{c}}^{2}\)

\({\upsigma }_{\mathrm{e}}^{2}\)

\({\mathrm{h}}_{\mathrm{a}}^{2}\)

\({\mathrm{h}}_{\mathrm{m}}^{2}\)

\({\mathrm{r}}_{\mathrm{am}}\)

c2

BW28

H

1904 ± 363

842.8 ± 432.7

 − 566.8 ± 361.8

190.6 ± 292.4

7125 ± 316

0.20 ± 0.04

0.09 ± 0.05

 − 0.45 ± 0.20

0.02 ± 0.03

A

3828 ± 756

707.6 ± 473.4

 − 1642 ± 546

486.2 ± 286.8

6368 ± 463

0.39 ± 0.07

0.07 ± 0.05

 − 1.00 ± 0.16

0.05 ± 0.03

BW42

H

5735 ± 959

1845 ± 983

 − 2513 ± 909

658.3 ± 641.1

16,114 ± 761

0.26 ± 0.04

0.08 ± 0.04

 − 0.77 ± 0.15

0.03 ± 0.03

A

5951 ± 1,165

–

–

37.53 ± 510.75

16,358 ± 867

0.27 ± 0.05

–

–

0.00 ± 0.02

ADFI

H

30.13 ± 5.14

10.56 ± 4.94

 − 12.86 ± 4.66

1.49 ± 3.29

89.05 ± 4.18

0.25 ± 0.04

0.09 ± 0.04

 − 0.72 ± 0.14

0.01 ± 0.03

A

41.38 ± 8.66

9.42 ± 5.46

 − 16.86 ± 6.07

0.61 ± 3.34

86.30 ± 5.55

0.34 ± 0.07

0.08 ± 0.04

 − 0.85 ± 0.13

0.01 ± 0.03

RFI

H

8.89 ± 1.52

2.42 ± 1.33

 − 2.98 ± 1.31

–

27.20 ± 1.26

0.25 ± 0.04

0.07 ± 0.04

 − 0.64 ± 0.17

–

A

9.73 ± 2.25

1.25 ± 1.39

 − 3.15 ± 1.56

–

28.25 ± 1.56

0.27 ± 0.06

0.03 ± 0.04

 − 0.90 ± 0.27

–

RFIa

H

6.05 ± 1.55

1.10 ± 1.66

 − 1.52 ± 1.49

0.51 ± 1.24

27.52 ± 1.49

0.18 ± 0.05

0.03 ± 0.05

 − 0.59 ± 0.39

0.02 ± 0.04

A

6.53 ± 2.27

1.96 ± 2.09

 − 3.16 ± 1.95

0.36 ± 1.29

28.47 ± 1.71

0.19 ± 0.06

0.06 ± 0.06

 − 0.88 ± 0.25

0.01 ± 0.04

ADG

H

6.06 ± 1.25

–

–

1.73 ± 0.98

39.58 ± 1.55

0.13 ± 0.03

–

–

0.04 ± 0.02

A

6.84 ± 1.77

–

–

0.69 ± 1.07

40.04 ± 1.68

0.14 ± 0.04

–

–

0.01 ± 0.02

FCR

H

0.0015 ± 0.0003

–

–

0.0001 ± 0.0002

0.0104 ± 0.0004

0.12 ± 0.02

–

–

0.01 ± 0.02

A

0.0015 ± 0.0004

–

–

–

0.0105 ± 0.0004

0.12 ± 0.03

–

–

–

AbF

H

42.48 ± 5.89

18.47 ± 6.23

 − 17.92 ± 5.67

2.01 ± 3.65

48.83 ± 3.81

0.45 ± 0.06

0.20 ± 0.06

 − 0.64 ± 0.12

0.02 ± 0.04

A

59.36 ± 11.93

17.58 ± 7.68

 − 24.94 ± 8.11

0.78 ± 3.95

46.00 ± 6.72

0.60 ± 0.11

0.18 ± 0.08

 − 0.77 ± 0.10

0.01 ± 0.04

  1. BW28, body weight at 28 d of age; BW42, body weight at 42 d of age; ADFI, average daily feed intake; RFI, residual feed intake; RFIa, residual feed intake adjusted for weight of abdominal fat; ADG, average daily gain; FCR, feed conversion ratio; AbF, weight of abdominal fat
  2. bH, the relationship matrix that blends genomic and pedigree information; A, the pedigree-based relationship matrix
  3. c \({\upsigma }_{\mathrm{a}}^{2}\), direct additive genetic variance; \({\upsigma }_{\mathrm{m}}^{2}\), maternal additive genetic variance; \({\sigma }_{\mathrm{am}}\), covariance between direct and maternal genetic effects; \({\upsigma }_{\mathrm{c}}^{2}\), common maternal environment variance;\({\upsigma }_{\mathrm{e}}^{2}\), residual error variance; \({\mathrm{h}}_{\mathrm{a}}^{2}\), direct heritability; \({\mathrm{h}}_{\mathrm{m}}^{2}\), maternal heritability; \({\mathrm{r}}_{\mathrm{am}}\), genetic correlation between direct and maternal effects; c2, maternal environmental variance as a proportion of phenotypic variance. — represents close to zero
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Genetics Selection Evolution

ISSN: 1297-9686