Growth curve in Santa Inês sheep

The objective of this research was to use non-linear models to describe the growth pattern in Santa Inês sheep and to study the influence of environmental effects on curve parameters with the best-fit model. The models included the Brody, Richards, Von Bertalanffy, Gompertz, and Logistic models. We...

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Published in:Small ruminant research Vol. 105; no. 1-3; pp. 182 - 185
Main Authors: da Silva, Laíza Sofia Acioli, Fraga, Angelina Bossi, da Silva, Fabiane de Lima, Guimarães Beelen, Patrícia Mendes, de Oliveira Silva, Rafael Medeiros, Tonhati, Humberto, Barros, Camila da Costa
Format: Journal Article
Language:English
Published: Elsevier B.V 01-06-2012
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Abstract The objective of this research was to use non-linear models to describe the growth pattern in Santa Inês sheep and to study the influence of environmental effects on curve parameters with the best-fit model. The models included the Brody, Richards, Von Bertalanffy, Gompertz, and Logistic models. We used 773 field reports on 162 animals ranging in age from 120 to 774days, including 46 males and 116 females. The statistics used to evaluate the quality of fit included RMS (residual mean square), C% (percentage of convergence), R2 (adjusted determination coefficient) and MAD (mean absolute deviation). Of the fixed effects studied, the only significant relationship was the effect of sex on parameter A. The Richards model was problematic during the process of convergence. Considering all studied criteria, the Logistic model presented the best fit in describing the growth pattern in Santa Inês sheep.
AbstractList The objective of this research was to use non-linear models to describe the growth pattern in Santa Inês sheep and to study the influence of environmental effects on curve parameters with the best-fit model. The models included the Brody, Richards, Von Bertalanffy, Gompertz, and Logistic models. We used 773 field reports on 162 animals ranging in age from 120 to 774days, including 46 males and 116 females. The statistics used to evaluate the quality of fit included RMS (residual mean square), C% (percentage of convergence), R2 (adjusted determination coefficient) and MAD (mean absolute deviation). Of the fixed effects studied, the only significant relationship was the effect of sex on parameter A. The Richards model was problematic during the process of convergence. Considering all studied criteria, the Logistic model presented the best fit in describing the growth pattern in Santa Inês sheep.
Author Tonhati, Humberto
de Oliveira Silva, Rafael Medeiros
Fraga, Angelina Bossi
da Silva, Fabiane de Lima
Barros, Camila da Costa
da Silva, Laíza Sofia Acioli
Guimarães Beelen, Patrícia Mendes
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  givenname: Laíza Sofia Acioli
  surname: da Silva
  fullname: da Silva, Laíza Sofia Acioli
  organization: Centro de Ciências Agrárias, Universidade Federal de Alagoas, Rod. 104 AL N, km 85, Rio Largo 57.100-000, Alagoas, Brazil
– sequence: 2
  givenname: Angelina Bossi
  surname: Fraga
  fullname: Fraga, Angelina Bossi
  email: angelina.fraga@gmail.com
  organization: Centro de Ciências Agrárias, Universidade Federal de Alagoas, Rod. 104 AL N, km 85, Rio Largo 57.100-000, Alagoas, Brazil
– sequence: 3
  givenname: Fabiane de Lima
  surname: da Silva
  fullname: da Silva, Fabiane de Lima
  organization: Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Avenida Pádua Dias, 11, Piracicaba 13418-900, São Paulo, Brazil
– sequence: 4
  givenname: Patrícia Mendes
  surname: Guimarães Beelen
  fullname: Guimarães Beelen, Patrícia Mendes
  organization: Centro de Ciências Agrárias, Universidade Federal de Alagoas, Rod. 104 AL N, km 85, Rio Largo 57.100-000, Alagoas, Brazil
– sequence: 5
  givenname: Rafael Medeiros
  surname: de Oliveira Silva
  fullname: de Oliveira Silva, Rafael Medeiros
  organization: Centro de Ciências Agrárias, Universidade Federal de Alagoas, Rod. 104 AL N, km 85, Rio Largo 57.100-000, Alagoas, Brazil
– sequence: 6
  givenname: Humberto
  surname: Tonhati
  fullname: Tonhati, Humberto
  organization: Departamento de Melhoramento Animal, Universidade Estadual Paulista “Júlio de Mesquita Filho”, Campus de Jaboticabal, Via de Acesso Prof. Paulo Donato Castellane s/n, 14884-900 Jaboticabal, São Paulo, Brazil
– sequence: 7
  givenname: Camila da Costa
  surname: Barros
  fullname: Barros, Camila da Costa
  organization: Centro de Ciências Agrárias, Universidade Federal de Alagoas, Rod. 104 AL N, km 85, Rio Largo 57.100-000, Alagoas, Brazil
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SubjectTerms females
Growth rate
Hair sheep
logit analysis
males
Non-linear models
nonlinear models
sheep
Weight
Title Growth curve in Santa Inês sheep
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