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Title: Identification of climate-resilient Merino sheep using satellite images
Contributor(s): de las Heras-Saldana, S  (author)orcid ; Suarez , L A  (author)orcid ; Wahinya, P K  (author)orcid ; Bunter, K L  (author)orcid ; Brown, D J  (author)orcid 
Publication Date: 2023-07-26
Open Access: Yes
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Open Access Link: Access Link
Abstract: This study aimed to evaluate the potential use of data from Landsat 5 TM, 7 ETM+, and 8 OLI and meteorology SILO databases to characterise variation in environmental conditions across farms and identify resilient sheep with a low response in performance to changes in the temperature-humidity index (THI) and normalized difference vegetation index (NDVI). A total of 44,848 Merino sheep from 27 farms across Australia were used in this study. The dataset included sheep with complete pedigree and measurements for weaning weight (WWT) and post-weaning weight (PWT). The average NDVI and THI values during the 9 months prior to the phenotypic measurement were used in a linear reaction norm (RN) model with heterogeneous residual variances. The results revealed genotype by environment (GxE) interaction for WWT and PWT between extreme environments with reranking of sires' estimated breeding values along the NDVI gradient. Higher heritability and genetic variances were estimated in favourable environments. Accounting for GxE interactions could lead to a more accurate selection of resilient sheep to changes in climatic and vegetation variables in Australia, and existing environmental data is enabling for this purpose.
Publication Type: Conference Publication
Conference Details: AAABG 2023: 25th Conference of the Association for the Advancement of Animal Breeding and Genetics, Perth, Australia, 26th - 28th July, 2023
Source of Publication: Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.25, p. 394-397
Publisher: Association for the Advancement of Animal Breeding and Genetics (AAABG)
Place of Publication: Armidale, Australia
ISSN: 1328-3227
Fields of Research (FoR) 2020: 300307 Environmental studies in animal production
Socio-Economic Objective (SEO) 2020: 100412 Sheep for meat
100413 Sheep for wool
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication
School of Science and Technology

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