No way can I answer that question, Debbie. My Guineas focused more on my chickens when my flock was smaller. Once the numbers started to climb they focused more on each other. But in the Spring the males in the Guinea flock threaten my roosters. Since I have multiple breeding pens I have multiple roosters.
I had a half grown keet nail one of my silkie girls in the head causing a head injury. No way, no how will I ever house Guineas and Chickens together again. Nor will I allow any of my chickens brood eggs. Its just not worth it to me to take the risk.