If you really want them up there, go in after dusk/dark and put them up every night for a few nights, they will catch on.
I have a bunch of breeds (11 weeks now) and the BO were some of the last to use the roosts. Then I spent a few nights moving them from the tops of the nest boxes. Now they have all been roosting for the past 2 weeks or so.
I have a bunch of breeds (11 weeks now) and the BO were some of the last to use the roosts. Then I spent a few nights moving them from the tops of the nest boxes. Now they have all been roosting for the past 2 weeks or so.