I would leave them. Tragic yes, but the alternative is that you would have to raise any that hatched, and the whole point of this exercise is to give Mary the experience of being a broody, not you 

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Never happened in my flock with a single broody or two broodies on a single nest.Maybe we didn't understand each other?
I was imagining a scenario in which Mary does well for most of the incubation but quits before the end. What would you do with the eggs in that situation?
Thank you. What will be, will be.her plumage is stunning
Good luck with this!
That is definitely way more than you will need. But of course the older girls will love left-over crumble if you make it into mash.Next weekend's list (in case I forget anything)
- Rake the run
- Sweep with the magnet
- Take the ramp from the old little coop and put it in Mary's Hatchery
- Clean up the chicken fencing panels and get more if needs be
- Start setting up the Peggy exclusion zone
- Place water and food for Mary in the Peggy exclusion zone
- Assuming Mary's nest is in the roosting compartment by then, place a sheet of ply in the nest box
- Prepare the feeding station in the nest box
- Get chick crumbles
- Set up some form of shade over the nesting area.
Can someone suggest the weight of chick crumbles required? Would 20kg be excessive?
Good idea!That is definitely way more than you will need. But of course the older girls will love left-over crumble if you make it into mash.
Personally I would get a smaller bag if it is available, but if not then you know you can use up the leftovers.Good idea!