Descripción de la curva de crecimiento de pavos locales usando modelos no lineales

Abstract

Objective. Determine the best non-linear model to fit the growth curve of local turkeys managed under confinement in Michoacan, Mexico. Material and methods. Twenty-four and 43 female and male turkeys, reared under commercial conditions were given commercial feed. Birds were weighed weekly from hatch to 29 weeks of age. The Gompertz, Brody, Richards, von Bertalanffy and Logistic models were chosen to describe the age-weight relationship. Results. The best fitting model was selected based on the multiple determination coefficient (R2), the Akaike information criterion (AIC) and visual analysis of the observed and predicted curves. In both female and male, von Bertalanffy was the best model. The highest estimates of parameter A (mature weight) for both females and males were obtained with the von Bertalanffy model followed by the Gompertz and Logistic. The estimates of A were higher for males than for females. The highest estimates of parameter k (rate of maturity) for both females and males were, in decreasing order, for the Logistic, Gompertz, and von Bertalanffy models. k values for female turkeys was higher than for males. The age at the point of inflection (TI) and body weight at the age of point of inflection (WI) varied with the model used. The largest values of TI and WI corresponded to the Logistic model. Between sexes, the largest TI and WI values corresponded to males. Conclusions. The best models to describe turkey growth was the von Bertalanffy because it present the highest R2 and lowest AIC values.

Comparación del crecimiento y rendimiento cárnico de pollos F1 plumaje normal y de cuello desnudo, criados bajo condiciones de traspatio en un ambiente de trópico seco

“…En lo referente a la estimación de la curva de crecimiento de los pollos de ambos FEN se obtuvo mediante el modelo de Gompertz [14], puesto que este modelo a probado ser exitoso para tomar decisiones sobre prácticas de manejo en aves que podrían mejorar su potencial productivo [18]. Para utilizar dicho modelo, se utilizó la metodología del PROC NLIN de SAS [35] para estimar el valor de la ecuación (inicio, ascenso y descenso).…”

Predictive Equations of Carcass Characteristics and Primal Cut Weights of Native Mexican Guajolotes Using Body Measurements

“…be associated with the lack of genetic improvement practices due to the fact that these native poultry have remained unselected over the years since they are raised in extensive or backyard conditions (Juárez-Caratachea et al, 2019). However, Juárez-Caratachea ( 2004) suggests that variability among native guajolotes with respectto a particular trait represents an advantage in the systematic selection of the best individuals for the purpose of improving this characteristic.…”

La importancia de la cría de pavos (Meleagricultura) en Yucatán

“…Los pavos indios macho y hembra apenas alcanzan 4.5 y 2.8 kg de peso vivo respectivamente, a las 23 semanas de edad, en comparación con los pavos comerciales macho y hembra que alcanzan17.1 y 11.8 kg de peso vivo, respectivamente, a la misma edad (Segura-Correa et al 2017;Juárez-Caratachea et al 2019). El peso de los pavos macho de más de 12 meses de edad criados en el traspatio de varias comunidades de Michoacán estuvo entre 6.8 y 8.9 kg y en las hembras de 2.9 a 4.4 kg (López-Zavala et al…”