DOI: 10.1101/455196Oct 29, 2018Paper

Novel insights into the genetic relationship between growth and disease resistance in Pacific salmon

BioRxiv : the Preprint Server for Biology
Agustin BarriaJose M. Yanez


Background: Breeding for disease resistance has become a highly desirable strategy for mitigating infectious disease problems in aquaculture. However, knowledge of the genetic relationship between resistance and other economically important traits, such as growth, is important to assess prior to including disease resistance into the breeding goal. Our study assessed the genetic correlations between growth and survival traits in a large bacterial infection challenge experiment. A population of 2,606 coho salmon individuals from 107 full-sibling families were challenged with the bacteria Piscirickettsia salmonis. Growth was measured as average daily gain prior (ADG0) and during (ADGi) the experimental infection and as harvest weight (HW). Resistance was measured as Survival time (ST) and binary survival (BS). Furthermore, individual measures of bacterial load (BL) were assessed as new resistance phenotypes and to provide an indication of genetic variation in tolerance in salmonid species. Results: Significant moderate heritabilities were estimated for ADG0 (0.30 plus-or-minus sign 0.05), HW (0.38 plus-or-minus sign 0.03), and for the survival traits ST (0.16 plus-or-minus sign 0.03) and BS (0.18 plus-or-minus sign 0.03). In contr...Continue Reading

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