Genetic analysis of resistance in Mekong striped catfish (Pangasianodon hypophthalmus) to bacillary necrosis caused by Edwardsiella ictaluri

Journal of Fish Diseases - Tập 44 Số 2 - Trang 201-210 - 2021
Khoi Dinh Pham1,2, Jørgen Ødegård3,1, Sang Van Nguyen2, Hans Magnus Gjøen1, G. Klemetsdal1
1Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, Ås, Norway
2Research Institute for Aquaculture No. 2 (RIA2), Ho Chi Minh City, Vietnam
3AquaGen AS, Trondheim, Norway

Tóm tắt

Abstract

The aim of this study was to analyse four cohabitation challenge‐test experiments with Mekong striped catfish (Pangasianodon hypophthalmus) against the bacterium Edwardsiella ictaluri. The data were genetically analysed per experiment by three models: 1) a cross‐sectional linear model; 2) a cross‐sectional threshold model; and 3) a linear survival model, at both 50% mortality (for models 1 and 2) and at the end of the test (for all three models). In two of the experiments (3 and 4) that were carried out in two replicated tanks, the predicted family effects (sum of sire, dam and common environmental effects) in each tank were correlated with the family survival in the other replicated tank (cross‐validation). The heritability estimates of resistance to E. ictaluri infection were ≤ 0.012 with the survival model, and up to 0.135 – 0.220 (50% survival) and 0.085 and 0.174 (endpoint survival) for the cross‐sectional linear and threshold models, respectively. The challenge test should aim for an endpoint survival that ceases naturally at 50%. Then, genetic analysis should be carried out for survival at the endpoint (reflecting susceptibility) with a simple cross‐sectional linear model.

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Thông tin xuất bản

Journal of Fish Diseases

Tập 44 Số 2

201-210

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