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In page Sheep shearer:

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On 2 March 2007, Broomehill shearer Brendan Boyle set the world 24-hour sheep shearing record by shearing 841 full wool Merino sheep, and in the process raised over $20,000 for the fight against prostate cancer. It was the first time a record has been set in 24 hours sheep shearing. However, for the record to be officially recognized, it needs to be overseen by the World Sheep Shearing Records Committee. This committee has a set of rules, and official referees in three member countries for the specific purpose of ensuring records are set under the same rules and consistent referees in these countries.[3]