Genetic (co)variance of rainbow trout (Oncorhynchus mykiss) body weight and its uniformity across production environments

Table 2 Estimates of variance components and genetic parameters of body weight at harvest and its uniformity measured under breeding and production environments, with or without log-transformation of the data

\( {\sigma}_p^2 \) = phenotypic variance \( \left(2{\sigma}_u^2+{\sigma}_c^2+{\sigma}_e^2\right) \), where \( {\sigma}_e^2 \) is the residual variance for body weight; \( {\sigma}_a^2 \) and \( {\sigma}_{a_v}^2 \) = additive genetic variance for body weight and its uniformity, respectively; \( {\sigma}_c^2 \) = common environmental variance; \( C{V}_{a_v} \) = coefficient of additive genetic variance for uniformity \( \left({\sigma}_{a_v}/{\sigma}_E^2\right) \), where \( {\sigma}_E^2={\sigma}_e^2-2\ast {\sigma}_u^2 \); h ² = heritability for body weight; c ² = common environmental effect due to full-sib tanks; \( {h}_v^2 \) = heritability for uniformity; \( {c}_v^2 \) = same as c ² but for uniformity of body weight.

ISSN: 1297-9686