Integrating flocks

[Chickenmomma86]

My big babies are about 4 Months old now. 2 silkies and a d'uccle Roo. I have 5 new d'uccle babies that will be 5 weeks on Friday. What should I do to start integrating them to the big babies.

 

[drinkoj]

This was my bible when I first did it a few months back.

https://www.backyardchickens.com/articles/my-coop-brooder-and-integration.74591/

 

[aart]

Here's a few other options, including the one linked above:
https://www.backyardchickens.com/articles/integrating-new-birds-at-4-weeks-old.72603/