| Revista: | Revista Brasileira de Zootecnia |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000445528 |
| ISSN: | 1516-3598 |
| Autores: | Ibiapina Neto, Vicente1 Barbosa, Firmino José Vieira2 Campelo, José Elivalto Guimarães3 Sarmento, José Lindenberg Rocha3 |
| Instituciones: | 1Universidade Federal do Piaui, Teresina, Piaui. Brasil 2Universidade Estadual do Piaui, Centro de Ciencias Agrarias, Teresina, Piaui. Brasil 3Universidade Federal do Piaui, Departamento de Zootecnia, Teresina, Piaui. Brasil |
| Año: | 2020 |
| Volumen: | 49 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico, descriptivo |
| Resumen en inglés | This study was conducted to examine the inclusion of random effects in non-linear models, identify the most suitable models, and describe the growth of naturalized chickens. Live-weight records of 166 birds of the Graúna Dourada, Nordestina, and Teresina ecotypes were estimated. The asymptotic weight (A), integration constant, related to animal initial weight (B), and the maturing rate (k) parameters of the non-linear Gompertz, Logistic, and von Bertalanffy models were estimated and adjusted using the Gauss-Newton method. Residual variance decreased by more than 50% when random effects were added to the model. The best fits in the estimate of the growth curve of females were obtained by associating the random effects with the three parameters of the Gompertz and Logistic models. The association of random effects with two parameters (asymptotic weight and maturing rate) and with the three parameters of the Logistic model provided the best fits for the males. The Teresina ecotype has the highest adult weight in both sexes, despite its slower growth. The opposite is true for the Graúna Dourada ecotype, formed by lighter and earlier-growing animals. The inclusion of random effects in models provides greater accuracy in the estimate of the growth curve |
| Disciplinas: | Medicina veterinaria y zootecnia |
| Palabras clave: | Aves de corral, Modelos mixtos, Modelos no lineales, Crecimiento, Modelo de Gompertz, Fenotipos |
| Keyword: | Poultry, Mixed models, Nonlinear models, Gompertz model, Growth, Phenotypes |
| Texto completo: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
