Many people, myself included, breed their rabbits by the phases of the moon or the Zodiac signs to breed specifically for bucks, does, breeders. For centuries, farmers used the moon to determine when to plant/harvest crops and breed their livestock for maximum benefits. Does it work? Well... it makes for interesting herd management.

Zodiac breeding calendar in quarterly files:
 PDF format: Please be patient as file downloads. ( average 60 KB PDF file). 
required to open files.
January through March 2005      April through June 2005
July through September 2005     October through December 2005

Full Moon breeding calendar
I've read somewhere (?) difficult-to-breed does are more cooperative at full moon.
Click here for a full moon chart through 2008.

Links:
Brightside Woolies. Breeding by the Phases of the Moon
Spring Valley Rabbitry. Breeding by the Phases of the Moon
Powell's Hoppy Acres. Breeding by the Moon
BunnyRabbit.com. Breeding Calendar for 2004
The Old Farmers' Almanac