I'd say he absolutely does NOT have enough hens. One of the reasons we let Eenie hatch, hoping for more pullets. But they take time to grow. And that won't happen if he kills them. I don't know that he WILL, just that he was aggressive toward them.
He wouldn't be separated to the point of not seeing the others, next to them. The small coop is portable and we could put it right by the run.
There are no older roosters or hens to teach him a lesson. I got four "pullets" and one ended up being Manny instead. They were all hatched more or less together.
He's not a bad boy. He doesn't peck or spur me. He wants to take care of the girls...but I can't let him hurt the chicks.
If he were a pure-blooded something, I might find him a home. But he's a mutt. If I give him away he'll be in a stew.
I have to do something though. The triplets are just too big to keep out of the flock much longer.
@Lilion : it's supposedly not supposed to happen, but my first hatch of chicks was also attacked by my rooster Théo. He attacked the broody Chipie as well as long as she kept the chicks, and she defended them fiercely, even though she was much smaller. I think he saw the chicks as strangers who had stolen his girl. They were not his chicks, so maybe he knew it. She was also like yours, being bullied by the rest of the flock, and I think her low status also played a part.
It was frightening enough that I let them live completely separated from him during the day; they were in the same coop at night, though. Real trouble for the chicks began when they were weaned at six weeks, and the rooster quickly took the broody back as "his" hen. She was no longer protecting them. But at six weeks they were sufficiently independent and clever to handle it.
I don't think a time out for your roo Mannie will necessarily change his behaviour, but it will allow the chicks to grow, be less fragile, and when you put him back the rooster will probably be at first more busy with the hens than thinking of the chicks.
On the other hand, I tried separating my rooster for just a few hours daily. I did it both with Théo last year, and again with my other rooster this year to protect his tiny hen Piou-piou who was wounded. They hate it absolutely. I couldn't do that to a rooster for days. It just makes them utterly depressed.
For those with roosters:
I was reading on a different thread that we shouldn't let roosters mate in front of us because it means we are lower in the pecking order than the rooster. Is this true?
I spend a lot of time with my chickens, mostly just watching them and relaxing, but lots of the time my eyes are closed and I enjoy just hearing them plucking grass and scratching around, making their little noises. It seems like it might ruin the peace of it if I have to keep watch to make sure Cesario isn't mating in front of me!
By the way, he doesn't seem ready for this yet. It's a hypothetical question.
Cesario :
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I’m not really legitimate to give advice, as i’m just beginning to see a way out of my rooster drama

. But I agree with
@rural mouse. Roosters mate, especially in the morning and evening, it's their main point in life. Why should they hide from you? You're not a dominant rooster. The only thing different I would add, is that for some of my older hens, coming to peck my leg is a way to protect themselves from being mated. So while I let the roosters mate in front of me, I don't let them do it close to the point of almost touching me, that feels like stepping on my foot.
There’s a lot of conflicting advice on how to handle roosters. But if something doesn't seem to make sense to you, you should take it with a grain of salt

.
*******
Dead.
Abigail.
I am still crying.
@notabitail i’m sorry for your loss. You posted lots of beautiful pics of chicken Abigail here. I can't say I feel like I knew her, but I know she was very special to you among your chickens. If or when you feel like it you could post again some of those pics of her.
I feel like you that those moments when you count the chickens are one of the most painful after a loss. It takes time.