This clue will make your stable ready prior to the time you would usually have to wait to harvest it. Take all of your horses out of the stable and make sure you have a few horses that are 38% ready or more. For this hint the horses don't need to be 100% ready to harvest at all.
Put one that is 38% (or more) ready back into your stable first and then put in about 5 or more of your other horses in. The other ones you put back in can be 0% ready it doesn't matter. As soon as you put that one horse in that was at least 38% ready, your stable will be ready to harvest.
You can do this again and again depending on how many horses you keep out that are 38% or higher. When you put the one in that is 38% ready then put the ones back in that are 0% that you just took out from your earlier go so you don't use up the ones that you can use (those that are 38% or higher) to harvest your stable again.
That wonderful thing about this tip is that you don't need to wait for your horses to reach the 100% ready mark which certainly makes it all a lot less tedious or time consuming. You've got to love that! This will get you to your Horse Power ribbon quickly and your Arborist or Farmhand ribbons faster including 100+ XP that goes with them.
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Source: eZine