Abstract
BackgroundCorrelated genetic response in survival to selection for high growth has not been reported in giant freshwater prawn (GFP) (Macrobrachium rosenbergii). The main aim of this study was to measure genetic changes and estimate heritability for this character (survival rate) and its genetic associations with body traits in a GFP population selected over eight generations from 2008 to 2015. Statistical analyses were conducted on 106,696 data records, using threshold logistic mixed model.ResultsThe estimated heritability for survival was 0.14 ± 0.04 and significant. Genetic associations of survival with body traits (weight, length and width) were weak, with the estimates of genetic correlations between the traits close to zero. Realised genetic changes in survival, calculated as the difference in estimated breeding values between the selection line and control group within the same generation, was in positive direction but the estimates were not significantly different from zero regardless of the expression unit used either in actual unit of measurement or genetic standard deviation unit. On the other hand, communal testing of stocks in the latest generation, namely G7 (2015), showed that the selection line had 18% higher survival rate than progeny of the wild prawns originated from Mekong river. This result suggests that inadvertent changes in survival occurred during domestication-selection.ConclusionsIt is concluded that selection for high growth had no significant effect on survival in the present population of M. rosenbergii.
Highlights
Correlated genetic response in survival to selection for high growth has not been reported in giant freshwater prawn (GFP) (Macrobrachium rosenbergii)
Majority of selective breeding programs in aquaculture species have focused mutually exclusive on improving body weight or growth [1, 2]
To fill in the knowledge gap identified from the literature, in the present study we measured correlated response in this trait from a family selection program for GFP conducted over eight generations from 2008 to 2015
Summary
Correlated genetic response in survival to selection for high growth has not been reported in giant freshwater prawn (GFP) (Macrobrachium rosenbergii). The main aim of this study was to measure genetic changes and estimate heritability for this character (survival rate) and its genetic associations with body traits in a GFP population selected over eight generations from 2008 to 2015. To fill in the knowledge gap identified from the literature, in the present study we measured correlated response in this trait from a family selection program for GFP conducted over eight generations from 2008 to 2015. We report heritability that estimated for survival and its genetic associations with important body traits (live weight, total length and abdominal width) as well as survival rate of the selected line in comparison with one of the founder stocks used to form the base population
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