Instructions
Buy your rooster from a reputable breeder, as a history of living in poor conditions can make the rooster more aggressive. If it has been kept inside, you need to acclimatize it gradually to being outside in the day. Keep the rooster in a separate pen from the other birds for the first couple of weeks.
Add 2-foot vinyl hex fencing to wire or chain link fencing to protect against pecking. The birds should be able to see each other, but not get at each other. Gradually introduce the rooster to the flock for five-minute intervals. Stand by, ready to intervene if the fighting gets too vicious. Have plenty of enclosures so you can separate the roosters, in a hurry, if you need to.
Provide distraction and entertainment both when the rooster is on its own and when the flock is together. They should be able to have a dust-bath, scratch at some hay and roost on perches. Scatter food, such as cracked corn or sunflower seeds. Communal pecking is a calming activity and may prevent territorial fighting.
Hang a watermelon or a lettuce, so birds from both pens can peck and see each other, without being in a position to fight. Gradually increase the time birds spend together, but remain observant.
How to Introduce a New Rooster
If you keep hens and want fertile eggs, then you must keep at least one rooster, and more than one, if you have a large flock. Many country dwellers also enjoy being woken up by the sound of the rooster in the morning and you can have a fascinating time observing the rooster's behavior, particularly when battling for supremacy with another rooster. However, you must ensure that this fighting and competing does not get out of hand. A particular danger point is when you introduce a new rooster to the flock, so you must do this gradually and carefully.