Step 1: Understanding the Concept:
Anionic salts are used in dairy nutrition.
They affect the acid-base balance.
Step 2: Key Formula or Approach:
No specific formula.
Need to understand the use of anionic salts.
Step 3: Detailed Explanation:
Feeding anionic salts to dairy animals is done to manipulate calcium level.
It helps prevent milk fever by maintaining blood calcium.
Anionic salts create a mild metabolic acidosis.
This improves calcium mobilization.
Thus, they affect calcium level.
Step 4: Final Answer:
Anionic salts are used to manipulate calcium level.
Hence, the correct option is (C).