The study looked at how weaning weights of beef cattle have changed over time in the U.S. The researchers used data from different programs and auctions to track these trends. They found that weaning weights have been increasing steadily in some regions, but the rate of increase has slowed down in recent years. There is also a lot of variation in weaning weights between different areas, with Southern states showing more variability. This suggests that there are limits to how much we can continue to improve weaning weights in beef cattle.