Anyone had experience putting chicks under a broody after a mostly failed hatch?
I put 5 chicks under a broody with just a few of her own.
I put 3 chicks the same breed/color as her own chicks and 2 chicks of a completely different breed under her. She made some really weird noises at the yellow chicks (hers were all BAs, and thus black and yellow), but within about 10 minutes she accepted them. She didn't peck them or act aggressively towards them, so I let things play out. She never even batted an eye at the additional 3 BAs.
I watched them very closely for a long time, but once she shoved them under her, she treated them all the same.
It is advised to do this at night, and to slip the other chicks directly under the hen. I did it in the mid afternoon (that's when I got home from the feed store with them, and didn't have a brooder set up at my house- the plan B was to take them to the neighbor's brooder, if the plan didn't work- it did), and it worked out fine.
My neighbor also put chicks under her BO broody. She only had one chick from her hatch. She placed an additional 17 chicks
in her pen with her. She put them in one at a time, and the hen accepted them all. Now this was late summer, and it wasn't cold in the coop, so there wasn't the danger of them getting too cold.
She added chicks of 3 different breeds. That hen never even noticed those chicks weren't the same color as her own chick.
Both of these hens were first-time broodies.
The chicks were 3 and 4 days old at the time. They were all already eating, so the adopted chicks already had a firm grip on eating and drinking and scratching and pecking. They took to being under a hen with amazing speed, even after spending the first few days under a light at the feed store. Within just a few minutes all the chicks knew to duck under Mum to get warm, like they had been doing it all along.
It seemed like the most important thing was the chicks were the same age as her own chicks. (The adopted ones were one day older)
Apparently hens can't count.
If I were you, I would get a few friends, the same age, for the chick and slip them directly under her. Then watch until you are certain they have been accepted. Also, have a plan B, already prepared, in case she does reject them.