Look back innth rabbit threads .. I used to commercially breed them so did a lot of info on here..
I had a mild stroke a while back and it's buggered a fair bit of my memory other wise I have given you the age of 21weeks female and 18 for a buck to get started etc etc. etc. & whether to take the buck to the doe or the other way round .. one way frequently results in a nasty fight and no mating.
Always supervise the matings as well , some does get nasty if the buck tries for a second go .
You can also tell by the redder plum colour of the females vulva if she is more likely to find mating acceptable . If there is no mating try the doe again in 3 days .
Best time for the mating up session is about 19.00 to 23 .00 hrs as thats when they mate the wild .
I think it is also something to do with the buck testicles being cooler in the evening , so producing a better " shot "
Are the does in separate cages ,. if not they need to be ASAP.