New to breeding chickens and I would like advise if ( 2) RIR hens and (3 ) New Hamshire hens can be put in a run / coop with 2- Orpington Roosters - one a buff and the other a white- and be able to take the weight of the rooster during mating process. Will she have leg issues, back issues etc. They would be in a run with 15 other orpington hens so they are not the sole hens for them to mate with. The RIR and New Hampshires are almost 6 months old and the orpingtons are almost 8 montns old. Any advise would be appreciated.