http://www.vox.com/xpress/2014/10/2/...-boilers-giant
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" modern-day chickens are more efficient at turning feed into breast meat. The researchers' metric for this was something they called the "breast conversion rate" of grams of feed into grams of breast meat. The 2005 breed was roughly three times as efficient as the 1950s one."
" modern-day chickens are more efficient at turning feed into breast meat. The researchers' metric for this was something they called the "breast conversion rate" of grams of feed into grams of breast meat. The 2005 breed was roughly three times as efficient as the 1950s one."

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