Improved calcium, Vitamin D3, and iron levels. Improved calcium level. The old idea that growing birds need massive amounts of calcium has been shown to be incorrect. Excessive calcium in the diet can be toxic, damaging the kidneys first, then depositing in tissues throughout the body. Different species and different individuals will have varying abilities to handle excess calcium.
Avian veterinarians see a small percentage of handfed chicks showing damage.
African Grey Parrots have been said to require large amounts of calcium. The individuals with seemingly high requirements for calcium should be examined carefully by an avian veterinarian. Improved Vitamin D3 level. Vitamin D3 is important in the metabolism of calcium. Excess Vitamin D3 is also toxic, leading to the same harmful effects seen with excess calcium.