Hi, it's good to see an update! It sounds like it's going well. I have never had more than 6 chickens at a time, so you are ahead of me!
It's good that you have a large brooder, do they have any little roosts in there? They will like jumping onto roosts at some point. You can use small branches if you have any, even just set them on the floor.
I think I moved my chicks out to the big coop around 4 weeks, when they were well feathered. It may depend on the weather for you since you got them early in the year.
As for coop size, it is likely to be too small. Here is a good article: https://www.backyardchickens.com/a/how-much-room-do-chickens-need
With 13 chickens, you will probably want more than one roost in the coop. I don't know if you will need more nest boxes. They say one box per 4 hens. Several will use the same box, they actually will wait in line for their favorite.
While you are getting ready to integrate them together, you might want to read articles on introducing newcomers to the flock. Often they don't get along and it's good to temporarily divide their shared space ("see but don't touch" method). There are many good suggestions on how to integrate youngsters with the older ones, in several different forums. It will probably be to the chicks' advantage that they outnumber the older girls.
Good luck and update us!
It's good that you have a large brooder, do they have any little roosts in there? They will like jumping onto roosts at some point. You can use small branches if you have any, even just set them on the floor.
I think I moved my chicks out to the big coop around 4 weeks, when they were well feathered. It may depend on the weather for you since you got them early in the year.
As for coop size, it is likely to be too small. Here is a good article: https://www.backyardchickens.com/a/how-much-room-do-chickens-need
With 13 chickens, you will probably want more than one roost in the coop. I don't know if you will need more nest boxes. They say one box per 4 hens. Several will use the same box, they actually will wait in line for their favorite.
While you are getting ready to integrate them together, you might want to read articles on introducing newcomers to the flock. Often they don't get along and it's good to temporarily divide their shared space ("see but don't touch" method). There are many good suggestions on how to integrate youngsters with the older ones, in several different forums. It will probably be to the chicks' advantage that they outnumber the older girls.
Good luck and update us!
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