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Genetic basis of host resistance to S. chrysophrii in farmed gilthead sea bream (Sparus aurata) population

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Kjetil Aune

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kjetil.aune@nofima.no

World Congress on Genetics Applied to Livestock Production; Aotea Centre, Auckland, 2018-02-11–2018-02-16

Aslam, Muhammad Luqman; Carraro, Roberta; Sonesson, Anna Kristina; Tzokas, Kostas; Tsigenopoulos, Costas S.; Rigos, George; Bargelloni, Luca; Meuwissen, Theo

The objective of this study was to investigate genetic basis of host resistance against S. chrysophrii and explore potential of genomic selection for this trait. Results on available genetic variation showed that resistance against this parasite is lowly heritable (h2 = ~ 0.12). We observed strong negative genetic correlation (rg = -0.549 to -0.807) of parasite count with production traits (i.e. body weight and specific growth rate) which signals possibility of indirect selection. Genome-wide association analysis revealed a locus at linkage group 17 which surpassed chromosome-wide Bonferroni threshold and might be involved in producing variation. Genomic selection improved accuracy of prediction by 8-23% compared to pedigree information.