Question

if there is no casen protien in milk so what happen

Answer 1

if casin not present in milk . milk cannot convert into curd . lactobaccilus make acidic environment which favour casin to convert into curd

Answer 2

because casein is a protein ,it's found mostly in dairy products with moderate to high protein content such as:
• low fat milk .
• yogurt.
• kefir .
• cheese .
• ice cream.