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Animal Breeding and Genetics
Asian-Australasian Journal of Animal Sciences 2002;15(5): 622-626.
https://doi.org/10.5713/ajas.2002.622    Published online January 1, 2002.
Estimation of Genetic and Phenotypic Covariance Functions for Body Weight as Longitudinal Data of SD-II Swine Line
Wenzhong Liu, Guoqing Cao, Zhongxiao Zhou, Guixian Zhang
Growth records over six generations of 686 pigs in SD-II Swine Line were used to estimate the genetic and phenotypic covariance functions for body weight as longitudinal data. A random regression model with Legendre polynomials of age as independent variables was used to estimate the (co)variances among the regression coefficients, thus the coefficients of genetic and permanent environmental covariance functions by restricted maximum likelihood employing the average information algorithm. The results showed that, using litter effect as additional random effect, a reduced order of fit did not describe the data adequately. For all five orders of fit, however, the change trends of genetic and phenotypic (co)variances were very similar from =3 onwards.
Keywords: Swine; Covariance Functions; Longitudinal Data; Restricted Maximum Likelihood; Random Regression Model

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