GMO used in cheese production

In You Can Thank Genetic Engineering For Your Delicious Cheese Levi Gadye explains how the cheese industry turned to genetically modified bacteria to make up for a potential short fall in rennet.

These enzymes, called rennet, are secreted by mucous membranes that line the calf’s fourth stomach. Harvesting rennet the old fashioned way requires slicing this stomach open, which in turn requires slicing open the baby bovine itself. This, as they say, kills the cow.

Rennet is used to make hard cheeses.