Please use this identifier to cite or link to this item:
https://hdl.handle.net/1959.11/28981
Title: | Longitudinal analysis of body weight and average daily feed intake during the feedlot test period in Angus cattle | Contributor(s): | Torres-Vazquez, Jose Antonio (author) ; Duijvesteijn, Naomi (author); van der Werf, Julius H J (author) ; Clark, Samuel A (author) | Publication Date: | 2020-05 | DOI: | 10.1111/jbg.12439 | Handle Link: | https://hdl.handle.net/1959.11/28981 | Abstract: | The objectives of this study were to compare different models for analysing body weight (BW) and average daily feed intake (ADFI) data collected during a 70‐day feedlot test period and to explore whether genetic parameters change over time to evaluate the implications of selection response. (Co)variance components were estimated using repeatability and random regression models in 2,071 Angus steers. Models included fixed effects of contemporary group, defined as herd-year-observation_date-age, with additive genetic and permanent environmental components as random effects. Models were assessed based on the log likelihood, Akaike's information criterion and the Bayesian information criterion. For both traits, random regression models (RRMs) presented a better fit, indicating that genetic parameters change over the test period. Using a two-trait RRM, the heritability from day 1 up to day 70 for BW increased from 0.40 to 0.50, while for ADFI, it decreased from 0.44 to 0.33. The genetic correlation increased from 0.53 at day 1 up to 0.79 at day 70. Selection based on an index assuming no change in genetic parameters would yield a 2.78%-3.13% lower selection response compared to an index using parameters estimated with RRMs and assuming these genetic parameters are correct. Results imply that it may be beneficial to implement RRMs to account for the change of parameters across the feedlot period in feed efficiency traits. | Publication Type: | Journal Article | Source of Publication: | Journal of Animal Breeding and Genetics, 137(3), p. 281-291 | Publisher: | Wiley-Blackwell Verlag GmbH | Place of Publication: | Germany | ISSN: | 1439-0388 0931-2668 |
Fields of Research (FoR) 2008: | 070201 Animal Breeding 060412 Quantitative Genetics (incl. Disease and Trait Mapping Genetics) 070202 Animal Growth and Development |
Fields of Research (FoR) 2020: | 300305 Animal reproduction and breeding 310506 Gene mapping 300301 Animal growth and development |
Socio-Economic Objective (SEO) 2008: | 830301 Beef Cattle | Socio-Economic Objective (SEO) 2020: | 100401 Beef cattle | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science |
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