Bayesian genetic parameters for body weight and survival of Nile tilapia farmed in Brazil

Pesquisa Agropecuária Brasileira

Alexandra Inês Santos²  Ricardo Pereira Ribeiro²  Lauro Vargas²  Freddy Mora¹  Luiz Alexandre Filho²  Darci Carlos Fornari²  Sheila Nogueira De Oliveira² 

[1] ,Universidade Estadual de Maringá Departamento de Zootecnia Maringá PR ,Brazil

关键词: Oreochromis niloticus;    correlation;    fish genetic improvement;    Gibbs sampling;    GIFT strain;    heritability;    Oreochromis niloticus;    correlação;    melhoramento genético de peixes;    amostragem de Gibbs;    linhagem GIFT;    herdabilidade;   

DOI  :  10.1590/S0100-204X2011000100005

来源: SciELO

【 摘 要 】

The objective of this study was to estimate genetic parameters for survival and weight of Nile tilapia (Oreochromis niloticus), farmed in cages and ponds in Brazil, and to predict genetic gain under different scenarios. Survival was recorded as a binary response (dead or alive), during harvest time in the 2008 grow-out period. Genetic parameters were estimated using a Bayesian mixed linear-threshold animal model via Gibbs sampling. The breeding population consisted of 2,912 individual fish, which were analyzed together with the pedigree of 5,394 fish. The heritabilities estimates, with 95% posterior credible intervals, for tagging weight, harvest weight and survival were 0.17 (0.09-0.27), 0.21 (0.12-0.32) and 0.32 (0.22-0.44), respectively. Credible intervals show a 95% probability that the true genetic correlations were in a favourable direction. The selection for weight has a positive impact on survival. Estimated genetic gain was high when selecting for harvest weight (5.07%), and indirect gain for tagging weight (2.17%) and survival (2.03%) were also considerable.

【 授权许可】

CC BY   
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