Straight shoulder is just one characteristic which may affect a market steer's performance in a feedlot.

A straight shoulder in a market steer can indeed impact its performance in a feedlot. The physical structure and conformation of a steer have direct implications on its growth, health, and overall marketability.

In this context, a straight shoulder may lead to issues such as reduced muscle development and a less efficient feeding pattern. A well-angled shoulder typically allows for better movement and muscle development, facilitating more effective feed conversion and thus, better overall performance. Conversely, steers with a straight shoulder may struggle to achieve optimal weight gain or muscle mass, which are critical factors in a feedlot setting where maximum weight gain and feed efficiency are desired.

In evaluating livestock, it is essential to understand that conformation traits such as shoulder structure are not just cosmetic; they have functional implications that can affect profitability. While the other options could suggest limitations in applicability or relevance, the connection between a straight shoulder and feedlot performance is significant enough to validate the statement as true. Thus, the answer aligns with the principles of livestock selection and evaluation where conformation can directly influence performance outcomes.