After having put down 5 pairs I have ended up with 3 pairs with eggs. Pair No.1 six eggs all clear, pair No2 two eggs. One fertile the other I now presume dead in shell. Pair 3 Eight eggs all fertile. Three have hatched so far, so the next one to hatch will go under pair 1 and the one after that under pair number 2, etc.
I shouldn't grumble but the other two pairs are the ones that I most wanted to get young out of. Anyway my way of thinking is if they both bring up at least one chick each then that will put them into the right cycle for round two, which fingers crossed will have better results.