Milk is often contaminated with sediment due to which main factor?

The primary factor leading to sediment contamination in milk is related to the cleanliness of the cow itself before milking occurs. If the cow is not properly cleaned, dirt, hair, and other contaminants can find their way into the milk during the milking process. Ensuring that the cow is clean is crucial for maintaining the quality of the milk that is produced. When cows are not adequately cleaned, these contaminants can introduce sediment into the milk, which can affect its safety and quality.

While improper cleaning of the milking apparatus, handling of the milk, and vaccination for brucellosis are important aspects of milk safety and quality control, they do not directly relate to the introduction of sediment in the same way that the cleanliness of the cow does. The direct introduction of physical contaminants from the animal itself is a more immediate cause for sediment problems in milk.