Here's why:
* Oxalates bind to calcium, preventing its absorption. This can lead to calcium deficiency, which can cause health problems like bladder stones, bone problems, and muscle weakness in guinea pigs.
* Goitrogens in collard greens can interfere with the thyroid gland.
What to feed your guinea pig instead:
* Hay: Timothy hay should make up the majority of their diet.
* Fresh vegetables: Bell peppers, parsley, cilantro, carrots, and spinach (in moderation) are good choices.
* Guinea pig pellets: Choose a high-quality pellet specifically formulated for guinea pigs.
* Fruits: Small amounts of fruits like strawberries, bananas, and blueberries are okay as treats.
Always consult with your veterinarian before making any major changes to your guinea pig's diet.