Which of the following is NOT an advantage of the modern market hog as compared to the old-fashioned market hog?

The modern market hog is often characterized by a number of advancements that enhance its overall quality and efficiency in production compared to old-fashioned market hogs. Among these characteristics, being leaner, more muscular, and more structurally sound are recognized advantages.

When considering the term "tighter" in the context of market hogs, it does not specifically signify an improvement over previous breeds. The modern market hog being "tighter" could imply a tighter body structure, but this term is not widely used in scientific discussions relative to overall advantages in composition, growth rates, or market qualities. In contrast, the other attributes associated with modern market hogs—lean muscle development, efficiency in feed-to-meat conversion, and enhanced structural integrity—are critical components that reflect selective breeding practices aimed at improving meat quality and production capabilities. Therefore, being "tighter" does not align with the recognized advancements in this context and is the correct choice as the option that is not an advantage.