Skip to main content

Table 2 Genetic parameters estimated using two animal models for body weight in Litopenaeus vannamei

From: An analysis of indirect genetic effects on adult body weight of the Pacific white shrimp Litopenaeus vannamei at low rearing density

Parameters

Animal model without IGE

Animal model with IGE

MSTG

OLTG

MSTG

\( \sigma_{{a_{d} }}^{2} \)

4.74 ± 2.55

6.26 ± 1.05

5.06 ± 2.46

\( \sigma_{{a_{s} }}^{2} \)

0.00395 ± 0.00282

\( \sigma_{{a_{ds} }} \)

0.00309 ± 0.0386

\( \sigma_{c}^{2} \)

1.29 ± 1.03

1.01 ± 0.96

\( \sigma_{t}^{2} \)

3.81 ± 0.61

1.46 ± 0.57

\( \sigma_{TBV}^{2} \)

11.63 ± 5.81

\( \sigma_{e}^{2} \)

8.34 ± 1.30

9.22 ± 0.58

8.18 ± 1.26

\( \sigma_{p}^{2} \)

18.19 ± 0.92

15.48 ± 0.57

15.88 ± 0.84

\( T^{2} \)

0.73 ± 0.37

\( h^{2} \)

0.26 ± 0.13

0.40 ± 0.06

0.32 ± 0.15

\( c^{2} \)

0.07 ± 0.06

0.06 ± 0.06

\( r_{{a_{ds} }} \)

0.02 ± 0.26

\( r_{g} \)

0.71 ± 0.11

0.68 ± 0.11

  1. IGE indirect genetic effects, MSTG individuals from all families were tested in multiple small test groups (105 square concrete tanks of approximately 3 m2), OLTG individuals from all families were tested in one large test group (a circular concrete tank of 300 m2), \( \sigma_{{a_{d} }}^{2} \) direct genetic variance, \( \sigma_{{a_{s} }}^{2} \) indirect genetic variance, \( \sigma_{{a_{ds} }} \) direct–indirect genetic covariance, \( \sigma_{c}^{2} \) common environmental variance, \( \sigma_{t}^{2} \) variance of the test tank effect, \( \sigma_{TBV}^{2} \) variance of the total breeding value, \( \sigma_{e}^{2} \) residual variance, \( \sigma_{p}^{2} \) phenotypic variance, \( T^{2} \) ratio of \( \sigma_{TBV}^{2} \) to \( \sigma_{p}^{2} \), \( h^{2} \) heritability, \( c^{2} \) common environmental coefficient, \( r_{{a_{ds} }} \) correlation between the direct genetic effect (DGE) and IGE, \( r_{g} \) genetic correlation on DGE between the MSTG and OLTG programs