Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/19019
Title: Australian Sheep Breeding Values for Worm Egg Count Retain Predictive Power Across Flocks in the Presence of GxE
Contributor(s): Li, Li  (author)orcid ; Swan, Andrew  (author)orcid ; Brown, Daniel  (author)orcid ; Van Der Werf, Julius H  (author)orcid 
Publication Date: 2015
Open Access: Yes
Handle Link: https://hdl.handle.net/1959.11/19019
Open Access Link: http://www.aaabg.org/aaabghome/AAABG21papers/Li21386.pdfOpen Access Link
Abstract: Genotype by environment interactions (GxE) for worm egg count (WEC) in Merino sheep were estimated in eight environments across Australia from the Sheep CRC Information Nucleus flock (IN). Genetic correlations between environments were estimated using a factor analytic model, with mean correlations for each environment ranging from 0.27 to 0.57 for an overall mean of 0.40, confirming the presence of large GxE effects for WEC. The industry genetic evaluation model for WEC fits a direct genetic effect averaged across environments, which is reported back to breeders as the Australian Sheep Breeding Value (ASBV), with a sire by environment interaction term to accommodate deviations in performance (not reported to breeders). This model was validated using the IN data, with results demonstrating that the average genetic effect does retain predictive power across environments, albeit with lower accuracy due to a lower heritability observed in the sire interaction model when GxE effects are large.
Publication Type: Conference Publication
Conference Details: AAABG 2015: 21st Conference of the Association for the Advancement of Animal Breeding and Genetics, Lorne, Australia, 28th - 30th September, 2015
Source of Publication: Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.21, p. 386-389
Publisher: Association for the Advancement of Animal Breeding and Genetics (AAABG)
Place of Publication: Armidale, Australia
ISSN: 1328-3227
Fields of Research (FoR) 2008: 070201 Animal Breeding
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
Socio-Economic Objective (SEO) 2008: 830311 Sheep - Wool
830310 Sheep - Meat
Socio-Economic Objective (SEO) 2020: 100413 Sheep for wool
100412 Sheep for meat
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
Publisher/associated links: http://www.aaabg.org/aaabghome/proceedings21.php
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication
School of Environmental and Rural Science

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