You can mate her any time she will accept the buck she goes to the bucks cage not the buck to hers or else she will fight . Though 28 days is not a bad period if your into serious meat breeding .
If you don't want to drag the doe down with too many litters leavee her for 6 weeks after giving birth
Female rabbits get excited at the string masculine smell of the buck and has what's called an ostreous this means she releases an egg in readiness of the hoped for mating . The ostreous occurs about every three days .
( I've had a stroke eight years ago and things like dates and numerical data have dropped out of my memory ..... so do see if you can check this up elsewhere )
Sit down , lay the doe on her back ...head to you whilst she is on your knees .. hold her firmly , don't be scared and she will lie there and not struggle and fall off injuring herself .
In this position gently press either side of her vagina with your index finger and thumb to reveal her vagina. If it is slightly swollen /plummy & a real strong rasberry red she should be mated . If it is pale & not inflated try again each day at the same time for the next few days till you indentify the cycle.
Rabbits sucessfully mate best at night , we used to do all out stock matings at around " evening silflay " 20.00 hrs till 01.30 . I think it is because it gives the doe a few hours of rest & quite for the sperms to settle on to the eggs.
Pregnancy varies depentent up in the cycle of the doe it runs 21 to 31 days so keep a record of it if you have several does so you can plan your herds production .
Keep at least two unrelated bucks to reduce cross breeding problems if you have more than five does
A meat doe is good for about 8 litters and then she starts to have erratic litters so plan for a replacement doe to be 21 weeks old when you cull the old doe .
A buck tends to lose it at about 2 & 1/2 yrs so plan for his replacment to be abut 20 weeks old when you cull the buck
Do make record cards for everything and actually fill them in , they are far more reliable than your data bank damaged neck top computer