What started out as an "oops" quickly became an intentional habit. I have three broody hens, and lots of girls using their nests. I try to watch what eggs I actually put under the hens, so I know when a new one is laid from a different hen, and I can remove it to refrigerate it. But this isn't always possible, and sometimes they'll lay one right during the end of incubation for the rest of the eggs. So the moment I see momma hens hopping out of their nests with their new hatches, I collect all remaining eggs and put them in the incubator inside. I hate the thought of "killing" an egg, and it can't go to the refrigerator at that point either, because my nieces and nephews would be disgusted at a partially developed embryo in the bowl when making breakfast. So I incubate them and wait and see. Since I don't know exactly when these eggs were laid, and how many days the broody hens sat on them before I collected them, I often don't know when they'll hatch. And because of that, I often don't know when to remove them from the egg turner and put them on the grate in the incubator. But that hasn't slowed anyone down! This last time I collected three eggs from the broody hens after they moved out. All three hatched - and none of them were EVER removed from the egg turner. One of them completely surprised me because he was only in there for about a week, and he was completely quiet until he had already pushed himself out of the shell! But when I reached in to get him and put him in the brooder, the bottom of his shell was still sitting in the egg turner where I had first placed it. The other two I heard, but didn't have ROOM to move them out of the egg turner. They are two weeks younger than the first one. So I left this last batch in the egg turner on purpose. Every. Single. Fertilized. Egg. Hatched. I didn't candle them at 7 and 14 days like I usually do. When I saw the first pip, I candled them all and set the "blank" eggs aside (no development what so ever). The others that had dark spots I left in there. ALL of the ones I left in there, hatched just fine, still in the egg turner. While I haven't tried to experiment to see if they NEED the turner (i.e. I haven't tried to incubate them without it, for the full 21 days), I now know that removing the turner for the last 3 days of incubation actually has NO effect what so ever on them. If anything, my hatch rate was BETTER by leaving them in it, than it has been when I took them out! And more importantly, while I often got pips on the wrong end when I removed them from the turner during those last three days, I had NONE of them pip the wrong end when I left them in it.