Im not sure, but I'd guess only small amounts if they can because of the sugar?
I seen my friend offering her rabbit freshly squeezed orange juice
Can rabbits even have orange juice, is it safe?
I'd be careful..... would they eat oranges in the wild? Doubtful. Also, even the best orange juice has added sugar and chemicals (and buns love sugar!)
I think the best juice to give them is diluted pineapple juice when they are moulting, it prevents furballs or so I have heard?
I would def avoid orange juice though, especially undiluted. We all know how fragile their tums are?