Perhaps the greatest challenge a breeder is faced with is how to properly set up new birds to ensure the best chance for breeding success. The quest to find the magic formula has proven to be frustrating and very time consuming for many.
Greys are just like people in that they are each individuals.
You cannot expect them all to conform to one set of standards and be happy. It is necessary to keep an open mind and use common sense regarding what will contribute to breeding success in your environment. I recently spoke with an individual who was having no luck breeding his pair of Greys. He decided to replace the female of the pair simply because she did not have any interest in her mate over one year. The complete absence of pair bonding behavior prompted his decision.