Homogenization. These days milk is homogenized because consumers were averse to the cream collecting naturally at the top. Homogenization involves forcing milk at high pressure through a very fine sieve so as to reduce the size of the fat globules to stop the fat rising to the surface.Before being allowed into the factory, milk from the farm is checked for the presence of antibiotics and other substances that could hamper the growth of yogurt cultures and endanger the production process.