I have a post in this thread (a way back) showing how I made "fences" using hardwire cloth for my foam incubators. I can make four (or more) different compartments in my incubator for separating egg/chicks. I can separate several lines using this method. For instance, in one compartment I may have eggs from a blackxblack mating and also eggs from a splashxblack mating. I will know all blues in that compartment came from one mating or pen and all blacks from another. So, I can keep track of up to eight or more pairings in one incubator.