What does the term 'smut' describe in relation to rabbit fur?

The term 'smut' in relation to rabbit fur specifically refers to slate grey fur that is considered not to conform to the established standard color for a particular breed. This is important in the context of rabbit breeding and showing because each breed has specific color standards that are recognized and expected. When a rabbit displays fur that is slate grey and deviates from the breed’s accepted colors, it is termed 'smut,' which indicates an undesirable characteristic in competitive settings. Understanding this definition is crucial for breeders and judges to maintain the integrity of breed standards.

The other options do not relate to the specific issue of undesirable coloration in rabbit fur. Excessive salivation pertains to health issues rather than fur quality. A narrow body type describes the physical conformation of a rabbit, and uniform color over the entire animal refers to a consistent coloration that meets breed standards, rather than indicating an undesirable trait like smut.