Modelling of growth alteration in Japanese quail after a selection experiment for body weight at 4 weeks of age

Abstract

The current study investigated the influence of selection for body weight (BW) on growth curve parameters in two lines of Japanese quail through a mixed model approach. Live BWs of 1400 Japanese quail were recorded at 3-day intervals from hatching to 42 days of age. Birds were distributed equally across lines (selected and control) and sexes (male and female). The asymptotic weight parameter (β0) values were always higher in Gompertz than Richards models in both lines. The values of β0 were higher in the selected than control lines and in females than males across models. Differences were found in the inflection point for age and weight across lines and sexes. Values of the growth rate parameter (β2) ranged from 0.06 to 0.10 in both models, favouring males over females in both lines. Lower weights at the inflection point of both models were observed in the control line. Determination coefficient (R2) of both models in different genetic groups and sexes was similar. Mean square error (MSE) values of the Gompertz model were lower for females in selected v. control lines. In contrast, MSE values of the Richards model were lower for selected males v. control males. According to the criteria of choice (highest R2 and lowest MSE, Akaike information criterion and Bayesian information criterion), the Richards model was considered the best fitting model for the growth data of males, while the Gompertz model was the best for growth data of female quails in both lines.

Influence of Improved Microclimate Conditions on Growth and Physiological Performance of Two Japanese Quail Lines

“…The effects of sex and selection on the growth performance parameters were examined in the current study, the literature revealed differences between lines of various genetic backgrounds. The selection is a successful approach for quail performance and genetic enhancement, which may result in some alterations of physiological and metabolic processes that affect characteristics related to growth or egg production [ 30 , 31 , 32 , 33 ]. Since the growth trends of the sexes varied, females had significantly better BW and GR than males.…”

Preliminary extraction of catechin in cashew testa

“…The aluminum chloride colorimetric method was modified from the procedure reported by Chang and Yang [15]. First, a preliminary 50±10 mg of the dried extract (DE) was dissolved in 10 mL of MeOH.…”

“…Four specific factors would be considered and evaluated through the One-factor-at-a-time (OFAT) method, a traditional approach of designing experiments to evaluate the impact of an individual factor on a specific objective function [15]. These were multiple extraction, extracting temperature, extracting duration, and solvent-material ratio (table 1 for more details).…”