Abstract
ABSTRACT The objective of this study was to evaluate the adjustment quality of nonlinear models to data organs growth, carcass and body components of meat-type (Coturnix coturnix coturnix) and japanese laying-type (Coturnix coturnix japonica) quail. A total of 1350 quails from one to 42 d old were distributed in a completely randomized design, with five replicates each. To determine the organs growth (gut, heart, liver and gizzard), carcass and body components (wing, thigh and drumstick, back and breast), two quails per repetition were slaughtered weekly. The data were evaluated in function of different nonlinear models (Logistical, Brody, Richards, Von Bertalanffy and Gompertz). All models studied adjusted the data, differing in adjustment quality. Brody model showed the best description of gut length to all treatments. For the data gizzard weight, heart, liver and gut, the models that best adjusted, presenting smaller residual mean square and numbers iterations were Gompertz and Logistical. The Gompertz, Logistic and Von Bertalanffy models were the most adequate to describe the thigh and drumstick growth, back and breast, and Gompertz models and Logistic to describe the wing growth and carcass, showing lesser number of iterations to achieve the convergence of date, as well as low residual mean square and squares sums of the regression residuals. The Gompertz model was the most appropriate to describe the organs growth and body components in meat- and laying-type quail when evaluated in growth phase.
Highlights
The development of the bird as a whole can be interpreted as the sum of the organs weights and parts, where each part has its own characteristics of growth, which should be evaluated in ideal conditions or not limiting, for the occurrence the of expression of their maximum genetic potential.There are several factors that interfere in the growth curves, as well as: genetics, gender, nutrition, management and ambience
Comparison of the Quality Adjusting of Nonlinear Models for Organs, Carcass and Body Components in Meat-Type (Coturnix Coturnix Coturnix) and LayingType (Coturnix Coturnix Japonica) Quail organs at a specific age and concentrate information of a population in a few interpretable parameters (Freitas et al, 1983). All this information helps the producer and the industry in making decisions in relation to the best age for slaughter, the quail’s feed, in addition of genetic improvement, increasing carcass weight and specific prime cuts to meet the internal markets and of export. Considering these aspects, this study aimed to evaluate the adjustment quality of nonlinear models to date organ growth, carcass and body components of meat-type (Coturnix coturnix coturnix) and japanese laying-type (Coturnix coturnix japonica) quail
The results found in this work are correct, since all these items were considered in the evaluation method used
Summary
The development of the bird as a whole can be interpreted as the sum of the organs weights and parts, where each part has its own characteristics of growth, which should be evaluated in ideal conditions or not limiting, for the occurrence the of expression of their maximum genetic potential.There are several factors that interfere in the growth curves, as well as: genetics, gender, nutrition, management and ambience. Comparison of the Quality Adjusting of Nonlinear Models for Organs, Carcass and Body Components in Meat-Type (Coturnix Coturnix Coturnix) and LayingType (Coturnix Coturnix Japonica) Quail organs at a specific age and concentrate information (daily gain rate, size at maturity, age of maximum growth, among others) of a population in a few interpretable parameters (Freitas et al, 1983) All this information helps the producer and the industry in making decisions in relation to the best age for slaughter, the quail’s feed, in addition of genetic improvement, increasing carcass weight and specific prime cuts to meet the internal markets and of export
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