Update: My six eggs that were on day 3 when I put my first eggs into lockdown are now down to four and they're on day 16. I tossed one on day 12 (blood ring) and another on day 14 (early quitter). The bator was looking awfully empty with just five eggs in it after I chucked that first one, and so I set another ten eggs. Thought I might as well extend the experiment a bit more, as I'm finding it really fascinating so far. The odds are stacked against these ones even more cause as well as having to cope with the high humidity I'll soon need for locking down the first four, my bator is by now littered with eggshell fragments, chick dander, chick poo and dried hatching goop, so it's pretty unsanitary in there. Added to that, some of the latest eggs had been stored for almost two weeks prior to setting.
My results so far are as follows:
Original 8 eggs: 6 developed, 6 made it to lockdown, 5 hatched perfectly, 1 dead in shell (died approx day 18)
Next 6 eggs: 1 bloodring, 5 developed, 1 early quitter (died approx day 8), lockdown in two days...
Next 10 eggs: Due for candling on day 6, just before I lock down the other 4...
I'm not going to set any more. If this 'experiment' works out well I could have 15+ chicks in two weeks time.
Yikes! What WAS I thinking!?!