Estimation of genetic parameters for body weights of Nile tilapia Oreochromis niloticus using random regression models

Turra, Eduardo Maldonado; Oliveira, Denise Aparecida Andrade de; Valente, Bruno D.; Teixeira, Edgar de Alencar; Prado, Samuel de Assis; Melo, Daniela Chemim de; Fernandes, Arthur Francisco Araújo; Alvarenga, Érika Ramos de; Silva, Martinho de Almeida e

doi:10.1016/j.aquaculture.2012.04.035

Cited by 29 publications

(42 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For other traits, models considering homogeneous residual variance presented the best fit. Turra et al (2012a) also found a better fit for the weight in the tilapia Chitralada strain by models considering heterogeneous residual variance with 10 classes in 14-day intervals.…”

Section: Resultsmentioning

confidence: 99%

“…The residual variance (Figures 1, 2 and 3) was smaller than the other variances in most of the evaluation period except for the residual variance for the length (Figure 3), which was initially greater than the genetic, environmental and family permanent. This lower residual variance is possibly due to adequate experimental control (TURRA et al, 2012a).…”

Section: Resultsmentioning

confidence: 99%

“…A few studies involving random regression on fish data have been carried out, including those published by Mckay, Schaeffer and McMillan (2002) in rainbow trout, Rutten, Komen and Bovenhius (2005) with weight in Nile tilapia, Turra et al (2012a) and Turra et al (2012b) using random regression models in weight and fillet yield in Nile tilapia of the Chitralada strain.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, knowledge about the trajectory of heritability could help predict the response to selection in the age range evaluated and, thus, predict costs of breeding programs based on alternative ages (TURRA et al, 2012a).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Genetic parameters for weight gain and body measurements for Nile tilapias by random regression modeling

et al. 2014

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Genetic parameters for weight gain and body measurements for Nile tilapias by random regression modeling

et al. 2014

View full text Add to dashboard Cite

“…Um dos maiores interesses na produção de peixes triploides está relacionado à esterilidade gonadal que estes apresentam (FANJUL e TORO, 1991;KUSUNOKI et al, 1994;MELO et al, 2006;HUERGO e ZANIBONI-FILHO, 2006;TURRA et al, 2012;PRESTON et al, 2013).…”

Section: Introductionunclassified

Tetraploidia em Rhamdia quelen (Quoy e Gaimard, 1824) por choque térmico duplo (quente e frio)

Garcia

Júnior

Yasuy³

et al. 2017

Bol. Inst. Pesca

View full text Add to dashboard Cite

The efficiency of double thermal shock to induce tetraploidy in Rhamdia quelen (jundiá) at different post-fertilization periods was assessed. Each test was performed with 20 mL of eggs (10, 15, 20, 25, 30 and 35 mpf -minutes post-fertilization) exposed to hot thermal shock (39±0.2ºC) for 3 min, followed by cold thermal shock (1.0±0.1ºC) for 30 min. A control group was also employed. Fertilization and hatching rates were evaluated 12 and 30 hours post-fertilization (hpf), respectively. After 60 hpf, twenty-five larvae from each experimental unit were fixed to verify the ploidy by flow cytometry. Control fertilization rate was 87.83% and reached 23. 4%, 28.5%, 30.4%, 20.0%, 30.3%, 36.7% respectively for 10, 15, 20, 25, 30, 35 mpf. Tetraploids were detected only at 15 mpf and 20 mpf. This is the first research of tetraploidy in jundiá obtained by hot and cold shocks, making possible the improvement of this technique.Key words: jundiá; tetraploidy; thermal shock; poliploidy.. RESUMOAvaliou-se a eficiência do choque térmico duplo para induzir tetraploidia em jundiá Rhamdia quelen em diferentes tempos pós-fertilização. Vinte mililitros de ovos (10, 15, 20, 25, 30 e 35 mpf -minutos pós-fertilização) foram tratados com choque térmico quente (39±0,2ºC) durante 3 min seguido de choque térmico frio (1,0±0,1ºC) durante 30 min. Um grupo controle foi utilizado. As taxas de fertilização e de eclosão foram medidas 12 hpf (horas pós-fertilização) e 30 hpf, respectivamente. Decorridas 60 hpf, 25 larvas de cada unidade experimental foram fixadas para verificação da ploidia, por citometria de fluxo. A taxas de fertilização foram de 87,83% para o controle e de 23,4%; 28,5%; 30,4%; 20,0%; 30,3% e 36,7%, para os grupos tratados com choque térmico aos 10, 15, 20, 25, 30, 35 mpf, respectivamente. Encontraram-se tetraploides apenas nos grupos de ovos tratados aos 15 mpf e 20 mpf. Este é o primeiro trabalho de indução de tetraploidia em jundiá por choques térmicos quente e frio, o qual possibilitou o aperfeiçoamento dessa técnica.Palavras-chave: jundiá; tetraploide; choque de temperatura; poliploidia.

show abstract

Correlated changes in body shape after five generations of selection to improve growth rate in a breeding program for Nile tilapia Oreochromis niloticus in Brazil

et al. 2016

View full text Add to dashboard Cite

Body shape is a commercial trait of great interest as it impacts profit and productivity of aquaculture enterprises. In the present study, we examined correlated changes in two measures of body shape (depth to length ratio, DL-R and ellipticity of mid sagittal plane, EL-H) from a selection program for high daily weight gain in a Nile tilapia population reared in freshwater cages in Brazil. Genetic parameters for body shape and its genetic association with growth traits (body weight and daily gain) were also estimated from 8,725 individuals with growth performance recorded over five generations from 2008 to 2013. Mixed model analysis showed that the selection program resulted in substantial improvement in growth performance (about 4 % genetic gain per generation or per year) and also brought about trivial changes in body shape. The heritabilities ranged from 0.470 to 0.564 for growth traits and 0.180 to 0.289 for body shape. The common family effects were low for all traits studied, accounting for only 3-11 % of total phenotypic variance. The genetic correlations between body shape and growth traits were weak, i.e., -0.385 between EL-H and growth traits and 0.28 between DL-R and body weight or daily gain. Strong and negative genetic association was found between the two body shape traits (rg = --0.955). Harvest body weight and daily gain are essentially the same traits, as indicated by the close to one genetic correlations between the two characters. Our results demonstrated that the selection process to increase growth rate had small, but slowly constant effect in body shape traits; and in the long term, the fish would have become rotund.

show abstract

Estimation of genetic parameters for body weights of Nile tilapia Oreochromis niloticus using random regression models

Cited by 29 publications

References 15 publications

Genetic parameters for weight gain and body measurements for Nile tilapias by random regression modeling

Genetic parameters for weight gain and body measurements for Nile tilapias by random regression modeling

Tetraploidia em Rhamdia quelen (Quoy e Gaimard, 1824) por choque térmico duplo (quente e frio)

Correlated changes in body shape after five generations of selection to improve growth rate in a breeding program for Nile tilapia Oreochromis niloticus in Brazil

Contact Info

Product

Resources

About