Oh, I want to add, if your littles want to raise some purebred D'uccles, a second sectioned off area to isolate those birds for at least 3 weeks is a must... after 3 or so weeks, the only sire will be the d'uccle.
Chickens can lay fertile eggs for 2 to 3 weeks after the last time a rooster...
There is absolutely nothing wrong with mixed breed chickens!!!
Their eggs are JUST as delicious, and their meat i JUST as nutritious!!! I have often had mixed up flocks, and they are fun. You shouldnt sell them as anything other than mutts as I am positive you know, but if you want...