Sensitivity of breeding values for carcass traits of meat‐type quail to changes in dietary (methionine + cystine):lysine ratio using reaction norm models

Abstract

Our objective was to evaluate changes in breeding values for carcass traits of two meat-type quail (Coturnix coturnix) strains (LF1 and LF2) to changes in the dietary (methionine + cystine):lysine ([Met + Cys]:Lys) ratio due to genotype by environment (G × E) interaction via reaction norm. A total of 7000 records of carcass weight and yield were used for analyses. During the initial phase (from hatching to day 21), five diets with increasing (Met + Cys):Lys ratios (0.61, 0.66, 0.71, 0.76 and 0.81), containing 26.1% crude protein and 2900 kcal ME/kg, were evaluated. Analyses were performed using random regression models that included linear functions of sex (fixed effect) and breeding value (random effect) for carcass weight and yield, without and with heterogeneous residual variance adjustment. Both fixed and random effects were modelled using Legendre polynomials of second order. Genetic variance and heritability estimates were affected by both (Met + Cys):Lys ratio and strain. We observed that a G × E interaction was present, with changes in the breeding value ranking. Therefore, genetic evaluation for carcass traits should be performed under the same (Met + Cys):Lys ratio in which quails are raised.

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

“…These factors may contribute to the fact that several authors observed better adjustments of the models for body weights of meat quails with different numbers of classes, 3 (TEIXEIRA et al, 2012), 5 (BONAFÉ et al, 2011) and 6 (GONÇALVES et al, 2012). While evaluating and comparing four classes of heterogeneous variances to predict breeding values for body weights of quail, Miranda et al (2016) observed that the model with two classes of residual variance promoted the best fit, corroborating this study, in which most of the traits presented the best fit also considering two classes of heterogeneous residual variance.…”

“…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. The adjustment of the residual variance heterogeneity depends on the structure of the trait and population.…”

“…These results may be explained by the large weight gain during the first days of life, promoted by the increase of tryptophan in the diets (Table 4). Bonafé et al (2011) and Miranda et al (2016), studying amino acid ratios for meat quails, observed the presence of interaction between the genotypes and the evaluated environments (amino acid ratios). According to Table 4, correlations between the coefficients and were high and positive for P14 in both lines and for P28 in LF2.…”

Técnica De Sutura Em Quadrado Para Correção De Fenda Palatina: Relato De Caso

“…Diversos estudos demonstram que as relações aminoacídicas fornecidas nas dietas das codornas podem ocasionar alterações no valor genético dessas aves (Mota et al, 2015;Miranda et al, 2016). Assim, genótipos selecionados em um ambiente podem não apresentar o mesmo desempenho quando inseridos em outro ambiente (Alencar et al, 2005), o que é denominado interação genótipo-ambiente.…”

Incidência De TVT Em Animais Atendidos No Hvu-Ufpi, Em Bom Jesus, No Ano De 2018

“…Dentre os aminoácidos essenciais, a treonina desempenha um papel importante, uma vez que auxilia na formação de proteínas, colágeno, elastina e na produção de anticorpos (Umigi et al, 2007). Diversos estudos demonstram que as relações aminoacídicas fornecidas nas dietas das codornas podem ocasionar alterações no valor genético dessas aves (Mota et al, 2015;Miranda et al, 2016). Assim, genótipos selecionados em um ambiente podem não apresentar o mesmo desempenho quando inseridos em outro ambiente (Alencar et al, 2005), o que é denominado interação genótipo-ambiente.…”