What types of materials accumulate on filter pads during the sediment test of milk?

The accumulation of materials on filter pads during the sediment test of milk is primarily composed of insoluble extraneous matter, clots of milk, somatic cells, and bacteria. This test is designed to evaluate the quality of milk by determining the presence of impurities and sediment that may indicate issues with milk handling, processing, or storage.

Insoluble extraneous matter can include particles from the environment, such as dirt or feed contaminants, which can settle out of the milk. Clots of milk may occur due to poor quality or spoilage, indicating that the milk has not been properly pasteurized or has undergone undesirable microbial activity. Somatic cells are primarily white blood cells, and their presence in elevated numbers can signify mastitis in dairy cows, reflecting the health of the udder and the quality of milk being produced. Additionally, bacteria can be present in milk from improper handling or equipment contamination, contributing to spoilage and off-flavors.

The other options do not represent the type of materials typically tested in the sediment test for milk. For example, while water is a component of milk, it does not accumulate on filter pads in a sediment test. Similarly, grains and fibers are not relevant to the quality assessment of liquid milk, and pure water and