Heard that to. But in a recent hatch it did not work that way. Just an old wives tale. We made sure to know which chick came out of which egg to just make sure.
Well an old Cajun lady tried to show me that technique, but some of the ones I would have thought were pullet eggs, she said were rooster eggs, so I didn't see what she saw. I can only tell you I truely believe she must have known something, because it worked for her. I just didn't see it.
She loved her chickens. She actually lived with them. ( No kidding ) I am not really superstitous or spooky or anything, but I have often wondered if she didn't see something besides the shape when she looked at the eggs. I am sure there is technology to determine this stuff in a scientific way, but it would be too invasive and not feasible. I think we just have to take our chances and make chicken soup with the roos.
Since the girls determine gender of the eggs, maybe she was lucky enough to have girls who threw more girls.
Egg shape is determined by the shape of the reproductive tract in the hen, that tiny half of a cell called sperm doesn't affect anything other than gender.
I have come to feel that they are all good. They all keep my grass down. The hens lay eggs.....I only need a couple roosters and the others are really good for cutting down my food bill, as far as meat goes. I find them a bit better than the store bought also. The 6 year old seems a little aggrevated with me when she sees a dead or almost dead rooster hanging upside-down, bleeding from the neck. She asks me, a lot of questions,"Why you killed it....how u killed it.....why you taking off the feathers.....why couldn't I keep him......are you going to eat him?" Sometimes I think there would be a lot of people that would think that exposing the kids to that kind of lifestyle, would be abuse.
I guess it would be nice to hatch out a batch of only pullets for a flock, but provided you can put your foot down and kill a rooster or 2 every week and make it a regular chore, you should solve your rooster problem anyway. Besides, I find the feed costs less than the chicken meat.
The shape of the egg makes no difference - it's an old wives' tale. I have EEs and I know which hen lays which egg (they are all a different colour & shape). I hatch on average 50% pullets to roos from the narrow eggs, the pointy eggs, the fat short eggs, you name it. A hen will lay a certain shape of egg because of the shape of her unique reproductive tract and it doesn't vary with whether there's male or female DNA inside it.