I apologize if this has been asked before but I have been breeding 3 giant blue cochins - one roo and two hens. I don't really know their background, but I was expecting to get blue chicks from them. So far I'm getting a lot of black, lavender and only a FEW blues. What does this mean, and when I am looking for good breeders in the future, what do I need to know to ensure that they breed true? If I breed my second generation blues, will the third generation be blue or will they still produce different colors?