What term describes the healthy sheen of feathers indicating proper nutrition and management?

The correct term to describe the healthy sheen of feathers indicative of proper nutrition and management is "bloom." In the context of birds and falconry, bloom refers to a specific layer of natural oils present on the feathers that not only provides a visually appealing sheen but also serves protective functions. These oils help to waterproof the feathers and keep them flexible, which is essential for flight. A bird displaying a good bloom will have feathers that appear vibrant and well-maintained, signaling that it is receiving adequate care, a balanced diet, and proper environmental conditions.

While terms like luster, sheen, and gloss might refer to similar characteristics of brightness and appearance in feathers, they do not specifically denote the natural oils and health of the bird's plumage as effectively as bloom does. Bloom is particularly linked to living conditions and well-being, making it the more precise term in the context of falconry and avian health management.