Question

Barny defect of milk is due to -

• A. Intake of bitter weeds
• B. Using late lactation milk
• C. Overheating of milk
• D. Improper ventilation of milking byre / barn

Hint:

Associate common milk off-flavors with their causes: Oxidized (light/metal), Rancid (lipase/fat breakdown), Cooked (heat), Barny (environment), Malty (bacterial), Weedy (feed).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Milk readily absorbs ambient odors, leading to flavor defects. A common defect is a "barny" or "cowy" flavor. The question concerns the origin of this flavor.
Step 2: Detailed Explanation:
(A) Intake of bitter weeds: Causes a "weedy" or "bitter" flavor, not a "barny" flavor.
(B) Using late lactation milk: Can result in a "salty" or "rancid" flavor due to compositional and enzymatic changes, but not usually a "barny" flavor.
(C) Overheating of milk: Results in a "cooked" or "scorched" flavor due to protein denaturation and chemical reactions.
(D) Improper ventilation of milking byre / barn: Poor ventilation concentrates odors from manure and animals. Freshly milked, warm milk absorbs these volatile compounds, causing a "barny" or "cowy" off-flavor. This is the main reason for this defect.
Step 3: Final Answer:
The "barny" flavor defect in milk arises from odor absorption in poorly ventilated milking environments.