Which factor is NOT a major consideration in breeding gilt evaluation?

In breeding gilt evaluation, major considerations focus on traits that directly influence reproductive efficiency, overall productivity, and health of the animal. Structural soundness is crucial as it relates to the animal's ability to move efficiently and handle the physical demands of breeding and production. Sex characteristics are important because they help determine the animal's suitability for breeding in terms of conformation and reproductive traits. Size and volume are also key factors, as they can indicate the animal's growth potential and overall body capacity, which are important for reproductive success and productivity.

Cleanliness, while it may be important for health and management, is not typically considered a major factor in the evaluation itself. The primary focus is on genetic and structural traits that will directly affect the gilt's performance as a breeding animal. Thus, cleanliness does not have the same level of significance as the other factors listed when evaluating breeding gilts for selection purposes.