Journal article
Breeding for improved resistance to Edwardsiella ictaluri in striped catfish (Pangasianodon hypophthalmus): Quantitative genetic parameters
Journal of Fish Diseases, Vol.42(10), pp.1409-1417
2019
Abstract
Bacillary necrosis of Pangasius (BNP), caused by Edwardsiella ictaluri, is one of the most devastating diseases in stripedcatfish farming. To date, quantitative genetic inheritance of BNP resistance is not known in striped catfish Pangasianodon hypophthalmus. The main aim of this study was to estimate genetic parameters for BNP resistance in a breeding population of striped catfish undergoing four generations of selection for high growth. Specifically, the study examined whether BNP resistance is heritable to enable family selection and whether genetic improvement for enhanced BNP resistance may have detrimental effects on growth and survival rate. To test these hypotheses, 720 full- and half-sib families were challenged with E.ictaluri pathogen using injection and cohabitation methods over four years, from 2010 to 2012 and 2015. In total, the data included 398,234 animals in the pedigree, from which 18,849 animals had disease challenge test records and 39,103 siblings had growth performance. Both univariate and bivariate sire-dam linear and threshold mixed models were used to estimate (co)variance components for BNP resistance, survivals and growth traits. The estimates of heritability for the BNP resistance recorded as death or survival were low regardless of models used (0.10-0.16), whereas survival time (days post-challenge test) showed moderate heritability (0.35). The survival rate during hapa rearing had medium heritability (0.33-0.52). The genetic correlations of BNP resistance with body weight and survival were all positive (0.03-0.53), suggesting that selection of increased BNP resistance may have positive impacts on growth and survival traits, and these traits could be easily improved simultaneously in the selective breeding programme for striped catfish.
Details
- Title
- Breeding for improved resistance to Edwardsiella ictaluri in striped catfish (Pangasianodon hypophthalmus): Quantitative genetic parameters
- Authors
- Nguyen Thanh Vu (Corresponding Author) - University of the Sunshine CoastNguyen Van Sang (Author) - Research Institute for Aquaculture No. 2, VietnamTrinh Quoc Trong (Author) - Research Institute for Aquaculture No. 2, VietnamNguyen Huynh Duy (Author) - Research Institute for Aquaculture No. 2, VietnamNguyen Thi Dang (Author) - Research Institute for Aquaculture No. 2, VietnamNguyen Hong Nguyen (Corresponding Author) - University of the Sunshine Coast
- Publication details
- Journal of Fish Diseases, Vol.42(10), pp.1409-1417
- Publisher
- Wiley-Blackwell Publishing Ltd.
- Date published
- 2019
- DOI
- 10.1111/jfd.13067
- ISSN
- 0140-7775
- Organisation Unit
- Faculty of Science, Health, Education and Engineering; School of Science and Engineering - Legacy; Faculty of Arts, Business and Law; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering; Centre for Bioinnovation
- Language
- English
- Record Identifier
- 99451006202621
- Output Type
- Journal article
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- Collaboration types
- International collaboration
- Web Of Science research areas
- Fisheries
- Marine & Freshwater Biology
- Veterinary Sciences