Grass carp reovirus (GCRV) poses a severe threat to the global grass carp aquaculture industry, causing significant annual economic losses. Selective breeding for GCRV-resistant strains offers a fundamental and sustainable control strategy. This study provides the first systematic estimation of genetic parameters for GCRV resistance in grass carp, utilizing a high-quality pedigree population with a well-documented selection history. Resistance traits were defined as day of death (DD), binary test survival (BTS), and binary test-day survival (BTDS) from a challenge test. The heritability estimates from LM (at day 16) and from the other four models at day 7 were deemed the most reliable. Five statistical models were fitted to estimate variance components. Heritability estimates for resistance were low to moderate, ranging from 0.06 ± 0.02 to 0.32 ± 0.11 The EBVs (estimated breeding values) derived from CLM, CTM, TSDM, and LRM exhibited high correlations across models, indicating nearly identical rankings of families. However, correlations between EBVs from LM and those from the other four models were significantly lower, suggesting substantial family reordering. The low to moderate heritability estimates suggest that systematic genetic selection programs hold promise for enhancing GCRV resistance in grass carp.
Tao et al. (Fri,) studied this question.
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