Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/22504
Title: WormLoad: a pasture infectivity risk model of four nematode species in Australia
Contributor(s): Laurenson, Yan  (author); Kahn, Lewis  (author)orcid 
Publication Date: 2017
Handle Link: https://hdl.handle.net/1959.11/22504
Abstract: Gastrointestinal parasites cost the Australian sheep industry AU$436 million annually. Early warning of impending worm risk may reduce this cost by providing producers sufficient time to implement control strategies. The provision of 90 day weather forecast data at a 6km grid resolution across Australia (Australian Bureau of Meteorology) has enabled the development of a mathematical model to predict the risk arising from nematode pasture infectivity for inclusion in the Sheep CRC's 'AskBill' application. A biophysical modelling approach was used to simulate the on-pasture lifecycle stages of 4 nematode species (Haemonchus contortus, Teladorsagia circumcincta, Trichostrongylus colubriformis and Trichostrongylus vitrinus). Mortality and development/migration rates of each lifecycle stage were described using modified β-distribution functions to account for the impact of temperature and water availability. The model was parameterised against point estimates from available literature and experimental data for the 4 species (H.contortus: R 2 = 0.88, n = 1409; T.circumcincta: R 2 = 0.56, n = 243; T.colubriformis: R 2 = 0.61, n = 355; T.vitrinus: R 2 = 0.66, n = 147). In the absence of a model predicting the quantity of eggs deposited, a probabilistic approach was used assuming 1 egg species-1 sheep-1 day-1 (thereby accounting for stocking rate). The impact of anthelmintic treatments were accounted for by assuming that no eggs were deposited for the duration of claimed efficacy. Risk was calculated by summing the proportion of infective larvae available for ingestion for each nematode species across each day of prior egg deposition and adjusting for herbage availability, species fecundity and productive impact.
Publication Type: Conference Publication
Conference Details: Combating Zoonoses: Strength in East-West Partnerships, Kuala Lumpur, Malaysia, 04-08 SEP-2017
Source of Publication: 26th International Conference of the World Association for the Advancement of Veterinary Parasitology, p. 188-188
Publisher: World Association for the Advancement of Veterinary Parasitology (WAAVP)
Place of Publication: Malaysia
Fields of Research (FoR) 2008: 070708 Veterinary Parasitology
Fields of Research (FoR) 2020: 300909 Veterinary parasitology
Socio-Economic Objective (SEO) 2008: 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
Socio-Economic Objective (SEO) 2020: 280101 Expanding knowledge in the agricultural, food and veterinary sciences
HERDC Category Description: E3 Extract of Scholarly Conference Publication
Publisher/associated links: http://www.waavp2017kl.org/
Appears in Collections:Conference Publication
School of Environmental and Rural Science

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