We have 7 chicks in a good size brooder, they are now 10-11 days old. Currently using Brinsea Ecoglow brooder/warmer. We are regretting not getting a few more and were toying with the idea of going out and getting 3 or 4 more which are 5-6 days old. What are your opinions? Will the older ones hurt the younger ones?
If it helps, our breeds are:
Buff orp, Light Brahma, EE, black australorp and what looks like a new hampshire red
Additionally, if it is in fact ok to mix the ones I am suggesting, when is the age cut off?