This is what we call meaty progress

For example, in 1925, the average Tyson chicken lived approximately 112 days, weighed around 2.5 pounds at the time of slaughter, and had consumed about 4.7 pounds of grain per pound of its body weight. In 2010, the same chicken lived just 45 days, was slaughtered at an average weight of 5.63 pounds, and consumed just 1.92 pounds of grain per pound. Simply put, the animals live less than half as long, eat half as much and are more than double the size they were 100 years ago.

The Verge

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