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Drenching of sheep to prevent build-up of worm infestations is commonly practised on many properties in the agricultural districts of Western Australia. This is called strategic drenching.
Department of Agriculture, Western Australia
"Sheep drenching programms,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 10
, Article 5.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol10/iss10/5