What does the term "strain" signify in rabbit breeding?

The term "strain" in rabbit breeding refers to a stock of rabbits that possess distinct racial traits. This means that a strain is characterized by specific genetic attributes that are consistent throughout the group, differentiating them from others. Strains are often bred to enhance particular qualities, such as color, size, or temperament, which can lead to a more homogeneous lineage with desirable features for breeders and exhibitors.

In contrast, the other options do not accurately capture the meaning of "strain." A group of rabbits with varied characteristics would not represent a strain, as a key element is the consistency of traits within a strain. A well-known breed for its size may relate to a specific breed category but does not directly define what a strain is in the context of distinct traits. Lastly, a type of rabbit used in racing is unrelated to the concept of strain, which focuses more on genetic and physical attributes rather than specific uses or historical activities involving the rabbits.