Which of the following is NOT one of the major factors considered when evaluating market hogs?

When evaluating market hogs, several key factors are taken into account to ascertain the overall quality and marketability of the animals. Muscling, leanness, and structural soundness are all critical aspects that influence the desirability of a hog in the market.

Muscling refers to the development and thickness of muscle in a hog, as lean muscle mass is associated with higher meat yield and quality. Leanness is important because consumers often prefer leaner cuts of meat, which are also more economically favorable for producers. Structural soundness refers to the physical integrity of the animal, including its legs and feet, which is essential for its ability to move and thrive during growth.

Face shape does not significantly impact the market value or quality of hogs. While certain breeds may have desirable facial features, these attributes do not contribute to the hog's muscle mass, fat distribution, or overall health in the same way that the other three factors do. Therefore, face shape is not a major factor considered in the evaluation of market hogs, marking it as the correct choice for this question.