Abstract

The purpose of this study is to estimate the effects of environmental factors such as sex that affect the growth traits of the Pacific abalone (Haliotis discus hannai) breeding group and the trend of genetic change by generation. Phenotypic and pedigree data of shell length, shell width, and total weight at 30 months for 12,783 abalone breeding groups (F1 to F5) produced from 2005 to 2017 were used. To estimate genetic parameters, heritability, and breeding values ​​for the growth traits, generation and sex were treated as fixed effects, and the AIREMLF90 and BLUPF90 programs were used. The heritabilities of shell length, shell width, and total weight were 0.461, 0.469, and 0.346, respectively. As a result of estimating the genetic change trend for growth traits, a clear genetic increase trend was shown as generations passed. In order to improve the accuracy of dam selection and genetic improvement of future generations, it is especially important to minimize inbreeding by maintaining the genetic diversity of the population. In addition to systematic pedigree management of the population, continuous breeding research using genetic parameters and breeders is necessary.