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The subject of intentional breeding or meat rabbits is prohibited. The answers provided on this board are for general guideline purposes only. The information is not intended to diagnose or treat your pet. It is your responsibility to assess the information being given and seek professional advice/second opinion from your veterinarian and/or qualified behaviorist.
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FYI: Bunnies normally don't need a mineral block unless they are ill and have some kind of deficiency. The mineral blocks can cause a whole host of problems, from too much of one kind of mineral to an imbalance in their digestive system. (which can also lead ot poopybutt)
You'll find many pet supply places say it's good, but mineral blocks, salt blocks and vitamins are really not ideal for bunnies.