Comparing these numbers to almost one century ago, broilers took 112 days to grow to a 2.5-pound market weight in 1925.
These changes reflect the increasing demand for white meat over the past century, motivating the industry’s shift to supply chickens with “proportionally larger breasts.”
Dr. Michael Lilburn, a professor at Ohio State University’s Poultry Research Center, tells the Washington Post: “If people keep eating more and more chicken, chickens will probably have to get even bigger…We’ll have to increase the proportion of breast meat in each bird, too.”
“What people don’t realize is that it’s consumer demand that’s forcing the industry to adjust,” Lilburn said of the population’s penchant for chicken nuggets, wings, sandwiches and other cheap chicken products. “It’s a deceivingly small but vocal minority that are raising a lot of legitimate questions. The bulk of the U.S. population still doesn’t care where their food comes from, as long as its cheap.” 
