Response to within family selection for body weight in Nile tilapia (Oreochromis niloticus) using a single-trait animal model

Bolivar, Remedios B.; Newkirk, Gary F.

doi:10.1016/s0044-8486(01)00824-9

Cited by 85 publications

(56 citation statements)

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“…Based on multiple-trait analyses, heritability estimates for tagging weight were lower than those for harvest weight, and were similar to the ones obtained by Bolivar & Newkirk (2002), Rutten et al (2005) and by Rezk et al (2009). The estimates were also lower than those reported by Ponzoni et al (2005) Figure 1).…”

Section: Resultssupporting

confidence: 84%

“…When the pedigree of brood fish is monitored and all available sources of information are combined to estimate the genetic merit of fish, a greater selection response can be achieved and accumulation of inbreeding can also be prevented (Bolivar & Newkirk, 2002;Ponzoni et al, 2010). This strategy is recommended and may be implemented by the adoption of the best linear unbiased prediction (BLUP) procedure in a framework of mixed model methodology, which allows the simultaneous estimation of breeding values and adjustment for fixed effects.…”

Section: Resultsmentioning

confidence: 99%

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

Santos

Ribeiro

Vargas

et al. 2011

Pesq. agropec. bras.

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-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.Index terms: Oreochromis niloticus, correlation, fish genetic improvement, Gibbs sampling, GIFT strain, heritability. Parâmetros genéticos bayesianos para peso corporal e sobrevivência de tilápias-do-nilo cultivadas no BrasilResumo -O objetivo deste trabalho foi estimar parâmetros genéticos para a sobrevivência e peso de tilápias-do-nilo (Oreochromis niloticus), cultivadas em tanques-rede e viveiro de terra no Brasil, e predizer o ganho genético sob diferentes cenários. Mediu-se a sobrevivência como uma característica binária (peixe vivo ou morto), no período de crescimento de 2008 até a despesca. Os paramêtros genéticos foram estimados pelo modelo animal limiar-linear em análise bayesiana, pela amostragem de Gibbs. A população avaliada foi de 2.912 peixes individuais, que foram analisados juntamente com o pedigree de 5.394 peixes. As herdabilidades, com intervalos de credibilidade de 95%, obtidas para peso à identificação, peso à despesca e sobrevivência foram 0,17 (0,09-0,27), 0,21 (0,12-0,32) e 0,32 (0,22-0,44), respectivamente. Intervalos de credibilidade mostram 95% de probabilidade de que as verdadeiras correlações genéticas estejam em uma direção favorável. A seleção para peso tem impacto positivo na sobrevivência. O ganho genético estimado foi alto para a seleção quanto ao peso à despesca (5,07%), e o ganho indireto para o peso à identificação (2,17%) e à sobrevivência (2,03%) também foram consideráveis.Termos para indexação: Oreochromis niloticus, correlação, melhoramento genético de peixes, amostragem de Gibbs, linhagem GIFT, herdabilidade.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

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

Santos

Ribeiro

Vargas

et al. 2011

Pesq. agropec. bras.

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show abstract

“…The gains in body weight observed in the present study are similar to previously reported values (O'Flynn et al, 1999;Thodesen et al, 1999;Bolivar and Newkirk, 2002;Vandeputte et al, 2002). In a Finnish breeding program, genetic gains in weight ranged from 4.8 to 12.5% per generation.…”

Section: Discussionsupporting

confidence: 90%

Estimation of genetic parameters for growth traits in a breeding program for rainbow trout (Oncorhynchus mykiss) in China

Guo

Bai²,

Wang³

2013

Genet. Mol. Res.

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ABSTRACT. Genetic parameters and breeding values for growth traits were estimated in the first and, currently, the only family selective breeding program for rainbow trout (Oncorhynchus mykiss) in China. Genetic and phenotypic data were collected for growth traits from 75 full-sibling families with a 2-generation pedigree. Genetic parameters and breeding values for growth traits of rainbow trout were estimated using the derivative-free restricted maximum likelihood method. The goodness-of-fit of the models was tested using Akaike and Bayesian information criteria. Genetic parameters and breeding values were estimated using the best-fit model for each trait. The values for heritability estimating body weight and length ranged from 0.20 to 0.45 and from 0.27 to 0.60, respectively, and the heritability of condition factor was 0.34. Our results showed a moderate degree of heritability for growth traits in this breeding program and suggested that the genetic and phenotypic tendency of body length, body weight, and condition factor were similar. Therefore, the selection of phenotypic values based on pedigree information was also suitable in this research population.

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“…1993 ;Brzeski & Doyle 1995 ;Bentsen et al . 1998 ;Bolivar & Newkirk 2002 ;Ponzoni et al . 2005 ;Rutten et al .…”

Section: Genetic Improvement Of Tilapiamentioning

confidence: 99%

Tilapia

Tran¹,

Dinh²,

Ngo³

et al. 2011

Recent Advances and New Species in Aquaculture

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Response to within family selection for body weight in Nile tilapia (Oreochromis niloticus) using a single-trait animal model

Cited by 85 publications

References 13 publications

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

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

Estimation of genetic parameters for growth traits in a breeding program for rainbow trout (Oncorhynchus mykiss) in China

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