Estimação de valores genéticos para codornas europeias em função dos níveis da relação treonina: lisina da dieta: do nascimento aos 21 dias de idade

Faria, Gabriela Q.; Bonafé, Cristina Moreira; Souza, Karine Aparecida Rodrigues de; Silva, M. A; Costa, Leonardo Silva da; Lima, Heder José D’Ávila; Campos, F. G; Silva, R. B; Silva, A. A; Tarôco, Graziela; Rocha, G. M. F.; Miranda, Jéssica Amaral

doi:10.1590/1678-4162-8883

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…Saúde Prod. Anim., Salvador, v.19, n.4, p.403-414 Our results corroborate with the literature, which suggests the need to use residual variance heterogeneity, in terms that it promotes a better fit of residual variance while compared to the homogeneous variance (FARIA et al, 2017;TEIXEIRA et al, 2012;GONÇALVES et al 2012;BONAFE et al, 2011). Evaluating carcass traits of meat quails, Miranda et al (2016) also observed that the random regression models considering residual variance heterogeneity promoted better adjustment than the models that used homogeneous residual variance, as observed in this study.…”

Section: Resultssupporting

confidence: 86%

Sensitivity of breeding values of meat quail as a result of tryptophan: lysine ratios in the diet

Rodrigues

Sousa

Cruz

et al. 2018

Rev. bras. saúde prod. anim.

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SUMMARY We aimed to evaluate the random regression models that promote the best fit of residual variance predicting the breeding values of quail body weights and the sensitivity of its breeding values to the variations of different tryptophan:lysine ratios in the diets via reaction norms. A total of 1112 meat quails from LF1 and LF2 lines with 35 days of age were evaluated. During the period of 1 to 21 days of age, birds were fed with different tryptophan:lysine ratios (0.17, 0.20, 0.23, 0.26 and 0.29%) containing 2900 kcal ME/kg and 26.10% crude protein, followed by basal diet provided up to 35 days. The best model fit for residual variance was evaluated comparing heterogeneity (2, 3 and 4 classes) and homogeneity (1 class), including sex as fixed effect and the additive genetic effect as random. The second order Legendre polynomial was used to analyze the genotype x environment interaction using reaction norms. The model considering two classes of residual variance was the one that promoted the best fit of the data, being adopted to predict the breeding values. Thus, we observed changes in the sensitivity of the breeding values, characterized by the rearrangement of the breeding values, according to the different ratios of amino acids, suggesting the genotype x environment interaction.

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Section: Resultssupporting

confidence: 86%

Sensitivity of breeding values of meat quail as a result of tryptophan: lysine ratios in the diet

Rodrigues

Sousa

Cruz

et al. 2018

Rev. bras. saúde prod. anim.

View full text Add to dashboard Cite

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Heritability and genotype-environment interactions for growth curve parameters in meat-type quail fed different threonine:lysine ratios from hatching to 21 d of age

et al. 2019

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The aim of the present study was to estimate heritabilities and evaluate the existence of genotype-environment interactions for growth curve parameters in quail fed diets containing different threonine:lysine ratios. A total of 4,441 body weight information from two genetic quail groups (LF1 and LF2) fed diets containing 0.66%, 0.71%, 0.76%, 0.81%, and 0.86% threonine:lysine ratios from hatching to 21 d of age were evaluated. From 22 to 35 d of age, quail received a single diet. The Gompertz model was used to estimate growth curve parameters. Genetic analyses were performed using random regression models, by Legendre polynomials of the second kind, considering homogeneity of residual variances. The following characteristics were evaluated: asymptotic weight, asymptotic growth rate, and inflection point. Increases in threonine:lysine ratios promoted higher heritability estimates for these variables in the LF1 genetic group compared to LF2, which indicates that the additive genetic variation was modified due to the environmental variation influenced by the evaluated amino acid ratios, with differences between both genetic groups. Thus, it is recommended that quail be selected in the 0.86% ratio in genetic group LF1 and 0.66% in genetic group LF2, where greater heritabilities were observed. Dispersion of individual breeding values along the environmental gradient was observed for all evaluated characteristics, in both genetic groups, suggesting the existence of genotype-environment interactions for these variables. The evaluated amino acid ratios should be considered in quail breeding programs, since breeding value predictions for a determined threonine:lysine ratio are not valid for other ratios.

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Estimação de valores genéticos para codornas europeias em função dos níveis da relação treonina: lisina da dieta: do nascimento aos 21 dias de idade

Cited by 2 publications

References 8 publications

Sensitivity of breeding values of meat quail as a result of tryptophan: lysine ratios in the diet

Sensitivity of breeding values of meat quail as a result of tryptophan: lysine ratios in the diet

Heritability and genotype-environment interactions for growth curve parameters in meat-type quail fed different threonine:lysine ratios from hatching to 21 d of age

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