Hi thank you for replying, no he dosent chase the chicks, he is pecking at momma hen in the coop, he roosts overhead her and is pecking down at her, there is a wooden shelf between her and him but he is pecking downwards at her and if the chicks come out of the nest box hes pecking at them like hes sending them back into the nest with momma, he chased her this evening once she crouched for him to mount her but instead he pecked at her back pulling out some feathers and then he went into the coop left her be, yes I'm going to keep them in the nursery for another few weeks and try again, he dosent bother with momma hen and chicks in the run during daytime only displaying this behaviour when it's time to go into the coop and inside the coop but he has displayed this behaviour few nights ago but they were unharmed the following morning so I thought everything was okay until tonight I wasn't happy with his behaviour I witnessed in the coop so I removed momma and chicks and put them back in the nursery.