It’s commonly thought that diet is the optimal way to ensure that birds get the right amount of Vitamin D. It turns out that you can end up with too much or too little Vitamin D with diet alone and adding sunlight or UVB lighting is your best option.
Note: The research for this post mostly come from one article in a scientific journal, but it collects research from 69 sources so it’s pretty comprehensive.
There are two ways to get Vitamin D:
- Supplementation, typically in food
- UVB from sunlight or artificial lighting
Hypovitaminosis (low Vitamin D)
Low Vitamin D can lead to all sorts of problems. Birds can even get rickets!
Although vitamin D is critical to calcium/phosphorus homeostasis, bone formation and remodeling, there is evolution-based variation between species in vitamin D metabolism and susceptibility to rickets and osteomalacia.The pathology of vitamin D deficiency in domesticated animals: An evolutionary and comparative overview—International Journal of Paleopathology—December 2018
And here it’s noted that sunlight or UVB supplemention are in some cases required to have adequate Vitamin D levels.… READ THE REST