Question:
What is the range of pH of normal cow milk?
What is the range of pH of normal cow milk?
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Milk pH Diagnostics:
Normal Milk = pH 6.6 - 6.8.
Souring/Acidic = pH $<$ 6.5 (Bacterial growth).
Mastitic Milk = pH $>$ 6.8 - 7.4 (Alkaline shift from blood serum).
Normal Milk = pH 6.6 - 6.8.
Souring/Acidic = pH $<$ 6.5 (Bacterial growth).
Mastitic Milk = pH $>$ 6.8 - 7.4 (Alkaline shift from blood serum).
Updated On: Sep 7, 2026
- 6.6 - 6.8
- 5.6 - 6.5
- 7.4 - 7.8
- 8.6 - 9.0
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Fresh bovine milk physicochemical standards: natural amphoteric buffering by caseins and inorganic phosphates maintains a slightly acidic pH.
Key Formula or Approach:
\[ \text{Normal Fresh Cow Milk pH} = 6.6 - 6.8 \quad (\text{Mean } \approx 6.65) \]
Step 2: Detailed Explanation:
Physicochemical properties of fresh bovine milk:
- Normal fresh bovine milk is slightly acidic, with a standard physiological pH range of 6.6 to 6.8 (at $20^\circ\text{C}$).
- Milk pH drops below $6.5$ due to bacterial lactic acid fermentation (souring/spoilage).
- Milk pH rises above $6.8 - 7.4$ (alkaline shift) during clinical or subclinical mastitis due to increased vascular permeability allowing blood serum bicarbonate and sodium to flood the mammary gland.
Step 3: Final Answer:
Hence, the pH range of normal cow milk is 6.6 - 6.8, corresponding to option (A).
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