Nonlinear equations to determine the growth curve of immunocastrated pigs

The objective of this work was to compare the performance of the nonlinear Gompertz, logistic, and von Bertalanffy equations, to describe the growth curve of immunocastrated male pigs from birth until reaching 140 kg body weight. Standard error, number of iterations, mean square of the error, and co...

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Bibliographic Details
Published in:Pesquisa agropecuaria brasileira 2020-01, Vol.55
Main Authors: Ceron, Marcos Speroni, Oliveira, Vladimir de, Pieve, Natielei Alexandre Nunes Novais, Silva, Nhayandra Christina Dias e, Rossi, Carlos Augusto Rigon, Fraga, Bruno Neutzling, Muniz, Henrique da Costa Mendes, Kessler, Alexandre de Mello
Format: Article
Language:English
Subjects:
AGRICULTURE, DAIRY & ANIMAL SCIENCE
AGRICULTURE, MULTIDISCIPLINARY
Gompertz
growth rate
logistic equation
von Bertalanffy
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Summary:The objective of this work was to compare the performance of the nonlinear Gompertz, logistic, and von Bertalanffy equations, to describe the growth curve of immunocastrated male pigs from birth until reaching 140 kg body weight. Standard error, number of iterations, mean square of the error, and coefficient of determination were compared between the models. The logistic and von Bertalanffy equations do not accurately estimate the initial and slaughter weights. The Gompertz equation shows the highest reliability and is, therefore, the most suitable one to describe the growth curve of immunocastrated pigs from birth until 140 kg body weight is reached. Resumo: O objetivo deste trabalho foi comparar o desempenho das equações não lineares de Gompertz, logística e a de von Bertalanffy, para descrever a curva de crescimento de suínos machos imunocastrados, desde o nascimento até atingirem 140 kg de massa corporal. O erro-padrão, o número de iterações, o quadrado médio do erro e o coeficiente de determinação foram comparados entre os modelos. A equação logística e a de von Bertalanffy não estimam com precisão as massas inicial e de abate. A equação de Gompertz apresenta maior confiabilidade e é, portanto, a mais adequada para descrever a curva de crescimento de suínos imunocastrados, desde o nascimento até a obtenção de140 kg de massa corporal.
ISSN:0100-204X
1678-3921
1678-3921
DOI:10.1590/s1678-3921.pab2020.v55.01184