Many rabbit breeders breed by the Moon Signs. I have tried it, and I was very successful using the signs.
I have used the Moon signs to breed, and I found I did produce more does ( or bucks) according to when I bred. Also to breed during certain signs, the does were more receptive, and I was more likely to get a litter.
Most Fertile signs: Taurus, Cancer, Scorpio, and Pisces.