Sorry no one has responded to your questions, I'll try to help.
First off... how old are all your birds. That's very important info for anyone to help.
If your cockerel is in with pullets his age that's odd behavior, but he could be just following pecking order and not challenging his flock...
I seen them from Meyer and decided to pass. I only want Black Silvers. And thats where my Marans came from. Not saying their a bad hatchery. Opposite.. I like Meyer but I'm looking for breeder quality now soooo....
And I would be over the moon to get some from Bantambird.
As to your Rookie...
You need to come here and say hello,... https://www.backyardchickens.com/threads/international-black-copper-marans-thread-breeding-to-the-sop.1122465/page-2216
We talk all Marans and the wealth of knowledge is all here with breeding.
Birchen as in Black silver? Tell me more. I'm looking to get a Black silver flock but its hard finding good breed stock with no gold. I just have hatchery BCM's and need to bring in better quality birds.
Cockerels mature faster than pullets so he'll head for the hens if the pullets are afraid. Sometimes it takes a while for their Roo duties to sink in, their hormones are thru the roof til around 1 year old so its best to keep them with the big girls until the pullets begin to lay. I have 1 that...
I quoted your original post so I could see what breeds you had again. I'm only one sided with my boys so I can only offer a little bit with what breeds you have that I know about.
You should think about getting a Marans Roo. You have Marans, EE, OE and BR. So you could breed your Marans and...
That was the only breed she had I knew about for olive eggers. I know nothing about Legbars, so thank you for that.
I only have a EE hen with Kong, 1 of my BCM's and just hatched 3 Olive Eggers in June so I'm still learning about Olive Eggers. 👍
I must add as much as I "trust" all my boys and yep all the people that think I'm stupid for trusting any Roo (Yes, I've never claimed to be the sharpest tool in the shed) but I have grandbabies here on a daily basis and they do not EVER go near the pens without me covering them. We look but we...
Yes, there's horror stories galore about the damage they can do. I've only been flogged twice from behind from my Kong for walking in front of him and not setting treats down fast enough. The first time it startled me and we both jumped lol. The second time I woke up and decided to stop turning...
I don't have much insight in those breeds as far as temperament, I only have 3 BCM's and 1 Belgium D'Uccle. 4 separate flocks.
I think I would try the Ameraucana and keep one of your Cream Legbars.
If your Ameraucana is pure and depending how dark your Marans and Welsummer eggs are you should...