I usually throw a handful of the new in the old, mix it well and up it over about ten days, cutting the old out as I go. I do the same with hay if I get a different type.
I hope your girl will be okay without grain, tho I have my doubts...have yet to see a TB who does well on pasture/hay without any grain
IMO they are bred for early maturity and fast growth. Therefore they require a rather intensive diet. Just "greens" alone probably won't do it. But, it's certainly worth a try
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