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. If you put too much stress on the joints too soon, you can run into arthritis early.
noun. Legislation is defined as laws and rules made by the government. An example of legislation is a new state rule that changes textbook requirements. 1  the act or process of making a law or laws. 2  the law or laws made.
ACT -- Legislation enacted into law. A bill that has passed both houses of the legislature, been enrolled, ratified, signed by the governor or passed over the governor's office, and printed. It is a permanent measure, having the force of law until repealed. 1  Local act -- Legislation enacted into law that has limited application. 2  Private act -- Legislation enacted into law that has limited application.  Public act -- Legislation enacted into law that applies to the public at large.