I'd be interested to see an up-to-date article too, Devon. I posted this link not to suggest that one should follow the methods described to the letter, but more as "food for thought".
The number and types of weeds fed during that study fell woefully short of the abundance available. Sow thistle and shepherd's purse are excellent weeds but why did they feed so little of such wonderful weeds as dandelions, chicory, prickly lettuce, curly dock, purslane, clover, wild carrot and so on?
Some people may feed a natural diet because it is cheaper, but I think that most people who stick with it do so for other reasons. Not to be overlooked is the fact that every year on forums like this one, we hear of people losing rabbits to bad feed and weaning enteritis. When was the last time you heard of either of these problems from someone who is feeding naturally?
We have fourteen kits that have emerged from the nest tunnels in the past few days. They are still nursing when they can catch a doe, but they are also nibbling away on the greens. Already they come running when it's feeding time.
It's a pleasure to see them doing so well on forage gathered from our own acres. Yes, it's free, but I couldn't buy anything as good at the feed store.
