Basically the issue with the knees is you don't want to start riding a horse too strenuously until the knees close. For each breed it is different. Some close at 3, others, like drafts and WBs, can wait until 5 or so.
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The Legislation Register is managed by the Office of Parliamentary Counsel in accordance with the Legislation Act 2003. Getting Started. The Federal Register of Legislation (the Legislation Register) is the authorised whole-of-government website for Commonwealth legislation and related documents. It contains the full text and details of the lifecycle of individual laws and the relationships between them.