Where does rennet normally function?

Rennet normally functions in the stomachs of young ruminant animals, such as calves, lambs, and kids. Its primary role is to aid in the digestion of milk by curdling it, allowing the animal to absorb nutrients more efficiently. The active enzyme in rennet, called rennin or chymosin, breaks down casein, the main protein in milk, facilitating the formation of curds. This process is also utilized in cheese-making to separate curds from whey.