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no
It does not have to be large because the cocoons are minute.
The incubator used by the silk farmers is not large because the eggs of the moths are each smaller than the head of a pin.
Yes
If you can breathe in the room the incubator is located in then you will not need to supplement the air they need. Incubators are not airtight.
Depends on if you have a broody hen. If the hen is brooding then you do not need to incubate, if you have no natural brooder then yes, an incubator is needed.
use fertilized eggs
An incubator is used to hatch fertile eggs artificially. Nothing will hatch from an unfertilised egg.
but them in the frezzer
you need to have a liscence to be a farmer(:
Any non-viable eggs need to be removed, and whatever can be cleaned up should be.
farmers need is nothing only u can help a farmer