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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.
Don’t worry about what they ate. It is mostly a respiratory problem that is associated with mold spores. See if you can separate out the affected parts. If you have a shed outdoors I suggest you move the hay bale there, mold will not continue spreading in your temperatures. But do separate the affected bunches out generously. If you find that the bale is starting to be crazy dusty — do not use it as the black mildew dust is full of spores.
Seriously moldy hay looks like this
