Often a horse that shows some ability will be spelled shortly thereafter just so it had some experience and can grow some muscle and cartilage, and when it returns, not be so green. In other cases, there may be heat or shin soreness, so put it out and let it grow. And if it's being distracted, and not a superstar. they geld it in the hopes it will settle down and and return without the hormones. Also they grow massively in stature post gelding. (young horses that is).
But of course lack a little something else

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