HI we have class B's we have got larger and smaller birds when hatching just as any other breed of animal. Though as Buck Creek Chickens said if you pair them small most will be smaller but you can get a bigger bird at any point.... but here is something to think about that bigger bird will still be smaller then your other breeds.
So if you want a higher chance of having a smaller bird ask the size of the breeders birds. Also about fertility the smaller the less fertile.
I have not had the handling problem with our eggs as Buck Creek Chickens has had though we candle and the kids touch them through out incubation. I will have to try the other way and see how the hatch turns out, always great to have new ideas. We get about a 90* hatch rate here.
So if you want a higher chance of having a smaller bird ask the size of the breeders birds. Also about fertility the smaller the less fertile.
I have not had the handling problem with our eggs as Buck Creek Chickens has had though we candle and the kids touch them through out incubation. I will have to try the other way and see how the hatch turns out, always great to have new ideas. We get about a 90* hatch rate here.