Looking around the net for a breeding spreadsheet, but had no luck. so I made a very basic one, thought I'd share.
It might not be any use to anyone (other than me).
One is Excel format
other is Libre/Open office
There is a very cool set of forms on the Colorado 4H website. Also if you have winXP, the kintraks program is free. It will handle breeding schedules if you need to see more examples.