I don't have bobs, but I stopped grinding for my coturnix after a couple of days. Frankly, I am not sure it was ever necessary as there are enough tiny pieces and powder in every scoopful anyway. They pick around and find the sizes they need, in my opinion.
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I know this is true for the Nutrena Gamebird Starter. What I'm buying is a large percentage "dust" along with the crumbles. After keeping a generous amount of the "dust / crumbles mix" scattered on the floor of the brooder for introduction, they start picking up the crumbles by day-3 at the latest............most on day-2. At least.......that's what it looked like to me. After putting them in the brooder right out of the bator, (after they stand there for a few minutes in shell-shock), they start "feeding". And you can see them trying the larger size crumbles, but are quick to drop them (for the most part) because it's just a little too much to down right then, I guess. But, they will start downing those big crumbles before you know it.