Causes of the bad odor/off-flavors in milk.

• Bacterial contamination
• Poor sanitation or use poorly cleaned milk containers
• Animal diet such as that which contains wild onion or garlic
• Environmental factors such as poor ventilation in the barn can lead to a ‘barny’ odor in milk. Actually milk has ability absorb flavors from the environment
• Metabolic disorders such as ketosis can cause the milk to have unusual smell, like acetone while milk that contain lipase easily become rancid
• Oxidation: exposure to light or metals can cause the milk to oxidize, leading to cardboard-like or metallic smell.
• Sulfur compounds: Milk contains small amounts of sulfur-containing compounds, like methionine and cysteine, which can produce a slightly sulfurous or “eggy” smell when broken down.
• Milk can get bad odor due to treatment with some drugs

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