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Fisherlady :
x2
I am more concerned in summer brooding than winter brooding as I have had infertile eggs go bad in summer and explode...which makes a real mess. I've been lucky that my Silkie will roll bad eggs away...my other hen just sat on it (yuk).
I think cooler weather gives you a little more leeway time so I don't always worry about it until it's not hatching.
Lady of McCamley
Thank you both! Very helpful information.
She is currently indoors (about 70 F) in a special nest separate of the main flock. It's sort of a strange situation

I found her online, two broody Silkies actually, and bought them to set on eggs. I'm hatching several new breeds and will phase out my old (hatchery) stock next year. One of my silkies is broody now, and the other is still laying, but not broody. I have them in an indoor pen together. My hope was that they would co-mother together, but that remains to be seen!
The laying silkie's eggs continued to be fertile for a week+ (?!?!) after I got her. I cracked one open 11 days after she'd been here, it was still fertile! I was amazed... She has 5 silkie eggs under her, all laid between 2-4 days apart. No idea what the male is

it will be a surprise! I also ordered fertile hatching eggs for her, lol, so she is sitting on 9 (edit: 10! laid today.. silkie) eggs now, AND the incubator is almost full. my first time hatching

I was told she previously hatched 11 of 12 eggs on her last clutch, and that by having her indoors she can cover them all easily.
There are 7 days between the 1st silkie egg laid and the fertile eggs I bought. When those hatch earlier, I'm hoping she will see the rest of the eggs through until the end (1 extra week), otherwise I can put them in the incubator. I have read that sometimes, they will get up to show the chicks water and food, but continue to sit on the nest, even after eggs have quit sometimes. I'm going have to to trust the experienced mother silkie and see what happens
I really wish my second silkie would brood, otherwise I'm nervous about her acceptance of new chicks. I know you can slip chicks under a broody mother, but a non broody girl adopting chicks? It's a big unknown. She has raised 2 clutches already (she is 2 years old) and the currently broody has raised 1 clutch (1 y/o).