There are two main areas regarding the diet for your bird: are you only giving it seeds? are you providing enough Vitamin A, calcium, phosphorus, and Vitamin D3 which is necessary for the absorption of calcium and phosphorus?
However, you need to get the right balance of these, especially cockatiels, budgies, parakeets and finches that are sensitive to high calcium/Vitamin D3 levels.
Vitamin enriched seeds—the vitamins are sprayed onto the seed hulls which the birds discard and eat only the seed (without vitamins) or, if it comes with fortified pellets, many times the bird will not eat the pellets.
Fruits and vegetables are important to feed your bird, however, they should be removed after a few hours so they do not spoil.
Carrots: Vitamin A
Eggs: Hard boiled with shell –Vitamin A, calcium,
phosphorus and Vitamin D3.
Sweet potatoes: Vitamin A
Broccoli: Leaves and Flowers – Vitamin A, calcium
Spinach: Vitamin A
Collard Greens (washed): Vitamin A
Bone Meal: calcium and phosphorus
Mineral Block: Minerals
Seeds: 20% of diet
If you are feeding your bird pellets, be extremely cautious of vitamin/mineral toxicity if you decide to also provide vitamin supplements. FIRST, know what is in your bird’s food—fresh and pellets, and what level of vitamins they might need and can tolerate. If you need to change what you are feeding your bird, do it gradually. Also the droppings/feces color may change as you do this.