I've read a lot on the egg laying page about eggs with soft shells and the need to feed calcium to laying hens, especially if they're on grower feed. Two of my girls are laying but the other four are not so they're all on grower. I have no problems at all with soft shells. So that got me to wondering if maybe the ingredients that go in feed are different between Canada and the US. I'm pretty sure all animal feed is regulated in Canada, but don't know if that's the case in the US. Then I got to thinking if it has to do with breed....maybe some purebred birds have a gene the predisposes them to soft shells. Though I was told the two that are laying are EEs, I'm pretty sure they're heinz 57. So...my question is are there differences in feed ingredients between Canada and the US that might account for shell softness?