Step 1: Understanding the Concept:
Feed is a major cost in dairy farming.
It constitutes a large portion of the total cost.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the cost structure of dairy farming.
Step 3: Detailed Explanation:
In a dairy enterprise, feed cost is the largest component.
It accounts for approximately 60-70% of the total cost.
This includes both concentrates and roughages.
Thus, the approximate share is 70%.
Step 4: Final Answer:
The share of feed cost in total cost is approximately 70%.
Hence, the correct option is (C).