My black astrolorp has gone broody, yippee! She is sitting on 4 eggs that may, or may not be fertile. I have a bantam cochin roo, who mates with some, but not all. I can candle the eggs in a few days to determine. I'd like to find some rhode island red and buff orpington eggs, to put under her. But I wont have the eggs for another week. How do people manage a staggered hatch under a broody hen when the eggs are due to hatch a week apart?