Which physical trait is specifically described as lacking a feather in poultry?

The correct answer refers to the term "split tail," which is specifically used to describe a physical trait in poultry where a portion of the tail feathers is missing or naturally absent, creating a split appearance. This can occur in certain breeds as a characteristic feature or due to genetic factors. Recognizing this term is important for understanding different traits in poultry, especially when evaluating them for breed standards or competition.

Other options such as fluffed plumage, sparse feathers, and streamers don't convey the same specific idea of a feather being completely absent. Fluffed plumage describes feathers that are puffed out, often indicating a bird is trying to retain warmth or show aggression. Sparse feathers indicate a general thinning of feathers but do not specifically refer to a feather being missing. Streamers refer to long, flowing tail feathers that extend beyond the typical length, commonly found in breeds with long tails but do not imply the absence of feathers. Hence, split tail is the term that directly relates to the absence of feathers in that specific area.