Estimation of genetic parameters for growth traits in a breeding program for rainbow trout (Oncorhynchus mykiss) in China

Abstract

ABSTRACT. Genetic parameters and breeding values for growth traits were estimated in the first and, currently, the only family selective breeding program for rainbow trout (Oncorhynchus mykiss) in China. Genetic and phenotypic data were collected for growth traits from 75 full-sibling families with a 2-generation pedigree. Genetic parameters and breeding values for growth traits of rainbow trout were estimated using the derivative-free restricted maximum likelihood method. The goodness-of-fit of the models was tested using Akaike and Bayesian information criteria. Genetic parameters and breeding values were estimated using the best-fit model for each trait. The values for heritability estimating body weight and length ranged from 0.20 to 0.45 and from 0.27 to 0.60, respectively, and the heritability of condition factor was 0.34. Our results showed a moderate degree of heritability for growth traits in this breeding program and suggested that the genetic and phenotypic tendency of body length, body weight, and condition factor were similar. Therefore, the selection of phenotypic values based on pedigree information was also suitable in this research population.

Genomic prediction and variance component estimation for carcass fat content in rainbow trout using SNP markers

“…Family‐based rainbow trout breeding started late in China, initially involving only growth traits such as body weight and length (Hu et al, ). The animals from this rainbow trout breeding program used in our study exhibited an increased growth rate and a reduced market age compared with the local unselected strains on the Chinese market.…”

“…The experimental animals were obtained from the fourth‐generation (G 4 ) population of a freshwater rainbow trout breeding program focused on selection for large size based on body weight and other measured traits using a family‐based best linear unbiased predictor (BLUP) method (Hu, Gu, Bai, & Wang, ). The breeding program was located at the Bohai coldwater fish experimental station affiliated with the Heilongjiang River Fisheries Research Institute (HRFRI) of the Chinese Academy of Fishery Sciences (CAFS), located near Jingbo Lake (latitude 44.02°N, longitude 128.74°E).…”

Integrated analysis of lncRNA and mRNA expression in rainbow trout families showing variation in muscle growth and fillet quality traits

“…Fillet quality attributes, such as fat content, color and texture, are the primary determinants of consumer acceptability 9 . Recently, genetic selection was introduced in rainbow trout to improve flesh quality 10 , 11 . Selection on fat content affected color and fillet texture 12 , and this approach improved feed conversion ratio (FCR) and protein-retention efficiency 13 in rainbow trout.…”

Estimation of genetic parameters for growth related traits at different stages of development in Paralichthys olivaceus (Temminck & Schlegel, 1846)

“…Estimation of genetic parameters is the basis for selective breeding and planning of breeding programmes . Genetic parameter estimates for growth-related traits have been reported in certain fish, viz., Dicentrarchus labrax (Karahan et al, 2013), Salmo salar (Guy et al, 2009), Larimichthys crocea , Oncorhynchus mykiss (Sae-Lim et al, 2013;Hu et al, 2013), Hypophthalmichthys molitrix (Gheyas et al, 2009), Oreochromis niloticus (Trọng et al, 2013;He et al, 2015), Cyprinus carpio (Ninh et al, 2011) and Labeo rohita (Das Mahapatra et al, 2007). Determination of the estimated breeding values (EBVs) of the breeding candidates and genetic parameters of target traits for captive bred fish at present are commonly based on the restricted maximum likelihood (REML) and best linear unbiased prediction (BLUP).…”