I have 6 pullets that I have been feeding Countryside Naturals layer feed for the past 6 weeks. One of my girls has been laying for 3 weeks now (yippee!), but the other 5 are complete slackers and have yet to lay an egg. I didn't realize until after I got the feed that it is supplemented with calcium. My question is, is this feed dangerous to the kidneys of the girls who are NOT laying yet? They all look very healthy and happy but I would like to hear from some of the experts on this forum. Thanks!