I've only had trouble combining chicks of even 1 week apart in age.....even just 2 days apart going from bator to brooder was dicey, but for a very short time.
Had 3 groups spanning 6 weeks brooded in adjacent wire brooders had to be slowly integrated in day visits together in a day pen outside,
but I was also dealing with smaller spaces.....more space always helps.
Ya never know what will happen when you put live animals together!
Hope for the best and be prepared for the worst, know when to step in or let ride out.... but patience, observation and flexibility will eventually solve any issues.
Had 3 groups spanning 6 weeks brooded in adjacent wire brooders had to be slowly integrated in day visits together in a day pen outside,
but I was also dealing with smaller spaces.....more space always helps.
Ya never know what will happen when you put live animals together!
Hope for the best and be prepared for the worst, know when to step in or let ride out.... but patience, observation and flexibility will eventually solve any issues.