Final answer:
Heifer carcasses typically weigh less than steer carcasses due to physiological differences and the way they are raised for beef production, with steers usually reaching a heavier market weight.
Step-by-step explanation:
In the National Beef Quality Audits, heifer carcasses typically weigh less than steer carcasses. Heifers are female cattle that have not borne calves or that have only borne one calf. Steers, on the other hand, are male cattle that have been castrated and are raised primarily for beef production. Typically, steers are fed for a longer period of time and are thus marketed at a heavier weight compared to heifers. Additionally, the physiological differences between heifers and steers contribute to the variations in carcass weight. However, it should be noted that weights can vary depending on specific management and feeding practices.