What makes Duroc pork different from regular pork?

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What is the difference between Duroc pork and regular pork?

{"type"=>"root", "children"=>[{"type"=>"paragraph", "children"=>[{"type"=>"text", "value"=>"Duroc is a heritage breed with 2 to 3 times more intramuscular marbling than standard commercial breeds like Yorkshire. This means juicier, more tender, more flavorful pork with a deeper reddish-pink color. It is the difference between a premium steak and generic grocery store meat."}]}]}