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http://dx.doi.org/10.5713/ab.20.0618

Nonlinear mixed models for characterization of growth trajectory of New Zealand rabbits raised in tropical climate  

de Sousa, Vanusa Castro (Graduate Program in Animal Science, Federal University of Piaui)
Biagiotti, Daniel (Tecnhical College of Bom Jesus, Federal University of Piaui)
Sarmento, Jose Lindenberg Rocha (Department of Animal Science, Federal University of Piaui)
Sena, Luciano Silva (Animal Science, Federal University of Piaui)
Barroso, Priscila Alves (Department of Agronomy, Federal University of Piaui)
Barjud, Sued Felipe Lacerda (Graduate Program in Animal Science, Federal University of Piaui)
de Sousa Almeida, Marisa Karen (Graduate Program in Animal Science, Federal University of Piaui)
da Silva Santos, Natanael Pereira (Department of Animal Science, Federal University of Piaui)
Publication Information
Animal Bioscience / v.35, no.5, 2022 , pp. 648-658 More about this Journal
Abstract
Objective: The identification of nonlinear mixed models that describe the growth trajectory of New Zealand rabbits was performed based on weight records and carcass measures obtained using ultrasonography. Methods: Phenotypic records of body weight (BW) and loin eye area (LEA) were collected from 66 animals raised in a didactic-productive module of cuniculture located in the southern Piaui state, Brazil. The following nonlinear models were tested considering fixed parameters: Brody, Gompertz, Logistic, Richards, Meloun 1, modified Michaelis-Menten, Santana, and von Bertalanffy. The coefficient of determination (R2), mean squared error, percentage of convergence of each model (%C), mean absolute deviation of residuals, Akaike information criterion (AIC), and Bayesian information criterion (BIC) were used to determine the best model. The model that best described the growth trajectory for each trait was also used under the context of mixed models, considering two parameters that admit biological interpretation (A and k) with random effects. Results: The von Bertalanffy model was the best fitting model for BW according to the highest value of R2 (0.98) and lowest values of AIC (6,675.30) and BIC (6,691.90). For LEA, the Logistic model was the most appropriate due to the results of R2 (0.52), AIC (783.90), and BIC (798.40) obtained using this model. The absolute growth rates estimated using the von Bertalanffy and Logistic models for BW and LEA were 21.51g/d and 3.16 cm2, respectively. The relative growth rates at the inflection point were 0.028 for BW (von Bertalanffy) and 0.014 for LEA (Logistic). Conclusion: The von Bertalanffy and Logistic models with random effect at the asymptotic weight are recommended for analysis of ponderal and carcass growth trajectories in New Zealand rabbits. The inclusion of random effects in the asymptotic weight and maturity rate improves the quality of fit in comparison to fixed models.
Keywords
Absolute Growth Rate; Longitudinal Data; Model Selection; Oryctolagus cuniculus; Random Effect;
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