Oh, you probably were going to say something about the shape of the pelvic bones and vent which are both indications of laying, there are several others as well though.
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Alright then. My problem was with your generalization. There are many who are not concerned with productivity but not all.
I believe the Jersey Giant is considered a dual purpose fowl, aren't they? Ones obtained from a hatchery may lay very well because of what they cross into them to increase their ability. However, you generally cannot take a hatchery quality bird to any kind of show and do well. Also, the only way to know exactly how many eggs a bird is laying is to trap nest and a lot of people just don't have the time to do so... either that or you have to have one bird of whichever breed you choose which lays its own colored egg... that way would be easier, but that isn't a breeding project.
Ours were pretty good too. I have been temped to pick up some Austra-whites as well. They are a fun breed, pretty birds for sure. Our boston terrier used to run around the chicken yard trying to intimidate them but the Australorps would strut right up to him and force him to back off, was really fun to watch him shut down by a chicken!My Australorp is doing pretty good so far. 5-6 eggs a week, kind of like clockwork.