Why Does Swiss Cheese Have Holes?
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In this video:
The holes come from a byproduct of some of the microbes added to milk to make Swiss cheese. Specifically, there are three primary types of bacteria that are typically used to make Swiss cheese (these can vary slightly depending on the manufacturer): Streptococcus thermophilus; Lactobacillus helveticus; and Propionibacterium shermanii.
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Sources:
http://en.wikipedia.org/wiki/Swiss_cheese
http://en.wikipedia.org/wiki/Emmental_%28cheese%29
http://biology.clc.uc.edu/fankhauser/Cheese/Swiss_Cheese/Swiss_Cheese.html
http://www.professorshouse.com/food-beverage/food/swiss-cheese.aspx