This document summarizes procedures for examining milk samples from cattle. It describes how to collect milk from each mammary quarter, noting the importance of cleaning and labeling samples. Milk should be refrigerated if transported for testing. Physical examination of milk considers attributes like color, odor, consistency, pH and specific gravity. Chemical tests described are the Milk Ring Test to detect Brucella antibodies and the California Mastitis Test to detect somatic cells indicating infection. Somatic cell counts normally below 200,000 cells/ml indicate lack of mastitis.