I would say if you get white orpingtons from a hatchery, they are probably closer to australorp than orpington. Might be worth looking into and building upon them to develop nice looking australorps.
Hi,
I bought white australorps from efowl.com. I am actually trying to get rid of a few of them. We have too many healthy birds and way too many eggs. We just can't eat or get rid of all the eggs. I raised them from chicks and they are extremely hearty and rambunctious birds. Great egg layers!
They are probably the same as the white-austras, although I am not an expert. We love the black australorps so we decided to try the White Australorps...we like them too, but not as much as the blacks, although they do lay very well, but are quite ornery and smart. Check out this blog for more info....
I believe they are the same. We love the buff orpingtons and black australorps are a type of orpington, so we decided to get some white australorps. The black seem to be more docile and sweet whereas the white austras are ornery and smart.
It seems:
"The Austra White is cross between a Black Australorp and White Leghorns. It is a chicken developed for people who desire an abundance of white eggs and a calm hen to produce them."