I believe that you're looking for scholarly articles. Most aren't available to the general public but I did find this by googling: http://www.journalofanimalscience.org/content/84/1/58.long I'm not allowed to act as a search engine for you but I can recommend that you google the keywords "rabbit crossbreeding scholar article". These studies are necessarily going to be quite technical but perhaps that's what you're looking for. Good hunting!
Thank you for your kind accept. I appreciate it.