Constructing covariance functions for random regression models for growth in Gelbvieh beef cattle

Journal of Animal Science
A LegarraJ K Bertrand

Abstract

Genetic parameters for a random regression model of growth in Gelbvieh beef cattle were constructed using existing estimates. Information for variances along ages was provided by parameters used for routine Gelbvieh multiple-trait evaluation, and information on correlations among different ages was provided by random regression model estimates from literature studies involving Nellore cattle. Both sources of information were combined into multiple-trait estimates; corrected for continuity, smoothness, and general agreement with literature estimates; and extrapolated to 730 d. Covariance functions using standardized Legendre polynomials were fit for the following effects: additive genetic (direct and maternal), and animal and maternal permanent environment. Residual variances at different ages were fitted using linear splines with three knots. Fit was by least squares. The order of polynomials was varied from third to sixth. Increasing the fit beyond cubic provided small improvements in R2 and increased the number of small eigenvalues of covariance matrices, especially for the additive effect. Parameters for a random regression model in beef cattle can be constructed with negligible artifacts from literature estimates. Formulas ...Continue Reading

References

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May 23, 2000·Journal of Dairy Science·I MisztalT H Meuwissen
Jan 5, 2002·Journal of Animal Science·L G Albuquerque, K Meyer
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Citations

May 3, 2016·Journal of Animal Science·T M EnglishbyD P Berry
Dec 8, 2004·Journal of Animal Science·K R RobbinsJ K Bertrand
Jul 29, 2005·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Karin Meyer, Mark Kirkpatrick
Mar 27, 2012·The Journal of Dairy Research·Rúsbel R Aspilcueta-BorquisHumberto Tonhati
Oct 30, 2018·Journal of Animal Science·Warren M SnellingBruce L Golden
Jun 3, 2017·Journal of Dairy Science·G VisentinD P Berry
Sep 1, 2005·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·K Meyer
Mar 15, 2006·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·I Misztal
Apr 24, 2019·Tropical Animal Health and Production·Ahmed M SallamSamir M Alsheikh
Aug 26, 2014·Journal of Animal Science·M DufrasneN Gengler
Mar 21, 2013·Genetics and Molecular Research : GMR·R R MotaR A Torres

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