I've experimented some with does who are reluctant to mate. I've been told that
one should place the doe next to the buck for a day. What can I can when the
doe is already housed next to the bucks?

I have achieved a lot of of success with moving the doe (and litter) to a new cage in
a different section of the barn. Within 24 to 48 hours, the doe will normally raise for the
buck and allow mating. Playing "musical cages" may not work for everyone. If a doe is
constantly reluctant to mate, I find it easier to replace her than to accomodate her and possibly
have this trait in future replacements.

The attached research paper might be of interest.

Click to view attachment.