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Title: The relationship between a satellite derived vegetation index and wool fibre diameter profiles
Contributor(s): Whelan, Michael Barry (author); Geenty, Kennett  (author); Cottle, David  (author)orcid ; Lamb, David  (author)orcid ; Donald, Graham (author)
Publication Date: 2008
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Abstract: Satellite data provide a systematic and reliable method for recording pasture availability. Pastures from Space (PfS) provides estimates of pasture growth on a weekly basis throughout Australia. The wool fibre diameter profile (FDP) changes in response to feed intake and offers a mechanism for recording the nutritional status of sheep. The aim of this project was to define the nature of the relationship between FDP and a normalized difference vegetation index (NDVI) from PfS. The FDPs and weekly NDVIs were scaled to the same time period for 62 FDPs from 26 flocks throughout Australia. FDP and NDVI were graphed together and relationships were categorised as strong (39), neutral (17) and poor (6). Cross correlation and regression of rate of change of FDP and NDVI curves provide further characterization of the relationship. Supplementary feeding and temperature were factors that may contribute to poor correlations. Where strong relationships exist between FDP and NDVI, they could be used to predict tenderness and average diameter of the wool clip in a region. The relationship could also be used to predict the impacts of climate change on wool production.
Publication Type: Conference Publication
Conference Details: WCAP 2008: 10th World Conference on Animal Production - New World; Future World, Cape Town, South Africa, 22nd - 28th November, 2008
Source of Publication: Proceedings of the 10th World Conference on Animal Production
Publisher: World Association of Animal Production (WAAP)
Place of Publication: Italy
Fields of Research (FoR) 2008: 070203 Animal Management
Socio-Economic Objective (SEO) 2008: 830301 Beef Cattle
830310 Sheep - Meat
830311 Sheep - Wool
Peer Reviewed: Yes
HERDC Category Description: E2 Non-Refereed Scholarly Conference Publication
Appears in Collections:Conference Publication
School of Science and Technology

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