Ajuste de modelos não lineares em bovinos de corte I. padrão de crescimento da população.

Abstract

Three non-linear growth models: Gompertz, Logistic and Von Bertalanffy. were adjusted using Gauss Newton methods to weight-age data, from birth to 40 months of age, of male and female Canchim cattle, born from 1953 to 1975, in São Carlos, SP. The objective was to study the pattern of estimating body development in other breeds of beef cattle. The models provided coefficients of determination greater than 98.0%, except for Gimpertz, which did not converge for males, the others provided good quality of adjustment to the observed weights, for both sexes.