I really got a kick out of reading everyone's thoughts on this thread and I've decided to do a little experiment with sexing my Pioneer chickens. Of course, their 8 weeks old now so I'm not sure how well it will work with babies...
I bought 8 straight run pioneers at
TSC. The way they have acted, I assumed that I got all roosters. I can't bring myself to pick them up by the feet, neck, or beak (they're heavy little things for their age). I didn't even want to turn them all the way onto their backs, so as I was picking them up to put them into their outside playpen, I would hold them and tilt them till they were on their sides. I noticed that three of them stopped fussing and became still. After that I noticed that those three also had smaller combs than the others, so now I'm thinking maybe they ARE hens! The other ones fought the whole deal about being held sideways, and I'm pretty sure those are my roos.
When I later went to retrieve them I did that test again. When the same birds acted the same way I decided to put leg bands on them so I would be able to tell if that really worked. Like I said, they're 8 weeks old now- but the difference in the combs and feathers is almost non-existent.
Seems like it's a nicer way to
guess than picking them up in a way that I might hurt them. I'm not really digging the thought of trying to vent sex either.
Oh, and I also did this with the two little Leghorn pullets that I got at the same time. They too immediately stopped moving and stayed calm.