I live in Canada, so not sure what all your options might be. I use Front Runner, Phase 1. I know that it is available in some areas of the US as well.
Be careful using cheaper feeds. You often need to feed more to get the same results. With feed, it often is really a case of getting what you pay for. You don't need the most expensive feeds out there, but better to go with something made from quality ingredients.
What is your deworming schedule like with your colt? With my weanlings, I deworm once a month till December. We're in hard freeze by then. I then increase how long between worming.
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