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Table 2 Estimates (standard errors) of variance components and genetic parameters for weight and weight uniformity in different environments (nucleus, \(N\), and commercial, \(C\)) obtained from multivariate and univariate DHGLM models

From: Genetic parameters for uniformity of harvest weight in Pacific white shrimp (Litopenaeus vannamei)

  Multivariate Univariate
\(N\) \(C\) \(N\) \(C\)
Weight
 \(\sigma_{{u_{m} }}^{2}\) 4.45 (0.33) 1.60 (0.12) 4.42 (0.33) 1.60 (0.12)
 \(\sigma_{u}^{2}\) 8.90 3.20 8.85 3.19
 \(\sigma_{e}^{2}\) 19.06 6.64 18.98 6.60
 \(\sigma_{P}^{2}\) 23.51 8.23 23.40 8.19
 \(h^{2}\) 0.38 0.39 0.38 0.39
Weight uniformity
 \(\sigma_{{u_{m}^{*} }}^{2}\) 0.06 (0.01) 0.06 (0.01) 0.06 (0.01) 0.06 (0.01)
 \(h_{v}^{2}\) 0.02 0.02 0.02 0.02
 \(GCV_{e}\) 0.25 (0.01) 0.24 (0.01) 0.25 (0.01) 0.23 (0.02)
  1. DHGLM: double hierarchical generalized linear model. \(\sigma_{{u_{m} }}^{2} , \sigma_{{u_{m}^{*} }}^{2}\): additive variances of the mother plus father for body weight and its uniformity, respectively; \(\sigma_{u}^{2}\): additive variance for body weight defined as 2*\(\sigma_{{u_{m} }}^{2}\); \(\sigma_{e}^{2}\): residual variance; \(\sigma_{P}^{2} :\) phenotypic variance; \(h^{2}\), \(h_{v}^{2}\): heritabilities of weight and its uniformity, respectively; \(GCV_{e}\): genetic coefficient of residual variation for weight uniformity