12 Facts About Mayonnaise That May Surprise You — buzzfeed.com

Most American egg-laying hens are hatched in hatcheries, not on farms. The largest hatchery is Hy-Line Hatchery in Iowa, which provides female chicks to egg operations in more than 120 countries and has “its own in-house molecular genetics team leading the industry in application of DNA-based technology,” according to its website. At hatcheries like Hy-Line, the eggs will remain in incubator machines for about twenty-one days before hatching the chicks that will eventually lay the eggs that become mayonnaise.

Read More