Mothers with kits get full feed as do hutches with growing kits or growing breeding stock in them. Breeding bucks and does get are restricted on their feed so they will stay in great breeding condition. I use a weld wire nest box with card board liners in my rabbitry. I have found these types of nest boxes to be very handy to use. After the litter is raised, all I have to do is throw away the cardboard nest liner and put in a new one.
Nest boxes are very important piece of equipment in a rabbitry.
Another aspect I love about weld wire nest boxes is the following. In the cold months of the year I can use the card board liner in the nest box to keep the kits in the nest box very warm and protected from the cold. In the warm summer months I don't have to use the card board liner which keep the kits cool and avoids them being overheated. A mother rabbit uses a nest box to give birth to her kits. So you need a very good nest box.