This invention relates to the fields of molecular markers and animal genetic breeding technology, specifically to a
molecular marker located on
chromosome 4 of pigs that is associated with
body size and carcass traits, and its application. Using the F7 generation of a chimeric family as the
research object, this invention employs whole-
genome resequencing and GWAS analysis to study and identify the molecular markers located on
chromosome 4 of pigs associated with
body size and carcass traits. By optimizing the dominant alleles of these molecular markers, the frequency of dominant alleles can be increased generation by generation, enabling rapid and accurate selection of
body size and / or carcass traits, accelerating the progress of pig genetic improvement, and thus effectively improving the
economic benefits of
pig breeding.