my first flock had a cockerel and 3 pullets, all hatched and raised together. He was. So mean I had to put him in a bachelor pad so he couldn’t attack me. My flock has been added to over the years and the mean rooster passed away. When my oldest 3 hens were 3.5yo I added 2 cockerels 5 months old to my 13 hens. Those ladies schooled those young upstarts and whippersnappers!! They learned manners and how to dance for the ladies. The mean rooster had never danced!!! This was a new entertainment! I am now believing that young cockerels should be initially introduced to the oldest hens you can offer! Young pullets are just too vulnerable. I have a feeling the ladies warned them to behave with the big creatures that bring good, water, and snacks. My roosters are so good with me and my family! They are wonderful with the ladies and never attack me or hubby, not even if we have to grab a squawking hen for a treatment. Let the ladies teach them while they are young.