Why is sterile milk used in protein catapolism experiment?

Sterile milk is used in protein catabolism experiments to eliminate the presence of unwanted microorganisms that could interfere with the results. By using sterile conditions, researchers ensure that any observed changes in protein breakdown are solely due to the experimental variables being tested, rather than microbial activity. This helps maintain the integrity of the data and ensures more accurate and reliable results. Additionally, sterile milk provides a consistent source of protein for the experiment.