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https://hdl.handle.net/1959.11/3284
Title: | Genetic parameters for various random regression models to describe the weight data of pigs | Contributor(s): | Huisman, Abe (author); Veerkamp, R F (author); van Arendonk, Johannus Antonius (author) | Publication Date: | 2002 | Handle Link: | https://hdl.handle.net/1959.11/3284 | Abstract: | Various random regression models have been advocated for the fitting of covariance structures. It was suggested that a spline model would fit better to weight data than a random regression model that utilizes orthogonal polynomials. The objective of this study was to investigate which kind of random regression model fits best to weight data of pigs. Two random regression models that described weight of individual pigs, one using orthogonal polynomials, and the other using splines, were compared. A comparison with a multivariate model, Akaike's information criterion, and the Bayesian-Schwarz information criterion were used to select the best model. Genetic, permanent environmental, and total variances increased with age. Heritabilities for the multivariate model ranged from 0.14 to 0.19, and for both random regression models the heritabilities were fluctuating around 0.17. Both genetic and phenotypic correlations decreased when the interval between measurements increased. The spline model needed fewer parameters than the multivariate and polynomial models. Akaike's information criterion was least for the spline model and greatest for the multivariate model. The Bayesian-Schwarz information criterion was least for the polynomial model and greatest for the multivariate model. Residuals of all models were normally distributed. Based on these results, it is concluded that random regression models provide the best fit to pig weight data. | Publication Type: | Journal Article | Source of Publication: | Journal of Animal Science, 80(3), p. 575-582 | Publisher: | American Society of Animal Science | Place of Publication: | United States of America | ISSN: | 1525-3163 0021-8812 |
Fields of Research (FoR) 2008: | 070201 Animal Breeding | Socio-Economic Objective (SEO) 2008: | 830308 Pigs | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal | Publisher/associated links: | http://jas.fass.org/cgi/content/abstract/80/3/575 |
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Appears in Collections: | Animal Genetics and Breeding Unit (AGBU) Journal Article |
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