Yeah, just a year into keeping chickens and only my first really successful hatch and I've already figured out how to make them all pullets. I think Leghorns can be feather sexed (days 1-3 after hatch; day one being 24 hours after hatch). If you want, I'll PM or post you a link. =) My broody pecked at an egg with a chick in it yesterday, so I replaced the three she had left with three of DS's golf balls. Today, she abandoned the hatch. We were hoping the balls would hatch out clubs. Setting the eggs all at one time after she's been sitting for a few days, rather than letting her collect her own clutch over the course of a week or two, and then kind of beginning to sit, but not really sitting for the first few days, etc. Also, how long an egg is stored before incubation begins is a factor. Of my three eggs, one was laid the day I set them and I put it in the incubator still warm from being laid; the other two, I had collected the day before so they had been at about 65-70* for a day. I warmed up the incubator to about 80* for the rest of the day and overnight, then I brought the incubator up to 102 the next morning and counted that as day 1 of incubation. The one that was laid on the day I started warming the eggs hatched in the morning (already pipped when I got up at 7, which is when I started bringing the incubator up to temp). The other two pipped right before the first one hatched and took several hours longer to get out. IDK if that's everyone's experience, but that's what happened with my only successful hatch so far.