Which of the following is a performance record that could be kept for a group of market hogs?

Average Daily Gain (ADG) is a critical performance record for a group of market hogs as it measures the growth rate of the animals over a specific period. By calculating the average daily gain, producers can assess how efficiently the pigs are converting feed into body weight. A higher ADG indicates that the hogs are gaining weight effectively, which is essential for maximizing profitability in a market-oriented production system.

In comparison, while birth weight and weaning rate can provide valuable insights for breeding management and nursery performance, they are not typically used as performance metrics for market hog groups. Birth weight is more relevant for evaluating piglet viability and reproductive traits, while weaning rate focuses on the number of pigs weaned and is important for assessing the success of the breeding program rather than the performance of hogs in the market phase. Meat quality grade, on the other hand, pertains to the quality of the carcass rather than a direct measure of the growth performance during the finishing phase. Thus, Average Daily Gain stands out as the most relevant performance record for market hogs in a production context.