What is a crucial factor for judges when determining breed specialty in cavies?

Correct ear numbers are crucial for judges when determining breed specialty in cavies because ear shape, size, and specific features are often defining characteristics that set one breed apart from another. Each cavy breed has a set standard which includes precise ear measurements and criteria that must be adhered to for the animal to be considered typical of that breed. Judges assess these attributes because they play a significant role in the overall conformation and health of the cavy. Accurate ear numbers help ensure that the animal not only aligns with the breed specification but also reflects the ideal characteristics expected at competitions.

Other factors like the age, presence of markings, and weight of the cavy do hold importance in general evaluation but do not specifically define breed standards as unequivocally as correct ear numbers do. These attributes may help in assessing the overall condition or potential health issues but do not singularly indicate breed classification in the same way that ear characteristics do.