Question

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Milk fever occurs just after parturition in high yielding cows.
Reason (R): Just after parturition drain of most the blood glucose for the synthesis of lactose.
In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A).
• B. Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
• C. (A) is correct but (R) is not correct.
• D. (A) is not correct but (R) is correct.

Hint:

Keep the metabolic pathways distinct:
- Milk Fever = Hypocalcemia (calcium drain).
- Ketosis Hypoglycemia = Glucose drain for lactose synthesis.
This ensures you do not confuse the etiologies of transition cow diseases.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Metabolic diseases in dairy cattle commonly occur around parturition (the transition period) due to the sudden and massive nutritional demands of lactation.

Step 2: Detailed Explanation:
- Assertion (A) evaluation: Milk fever (parturient paresis) is a metabolic disease characterized by severe hypocalcemia. It typically occurs within 48 hours post-parturition in high-yielding dairy cows due to the sudden, massive demand for calcium for colostrum and milk synthesis. Thus, Assertion (A) is correct.
- Reason (R) evaluation: The statement in the Reason describes the metabolic cause of Ketosis or hypoglycemia (where a large volume of blood glucose is directed to lactose synthesis in the mammary gland). Milk fever, however, is caused by a drain of blood calcium, not glucose. Thus, Reason (R) is not correct as an explanation of milk fever.

Step 3: Final Answer:
Assertion (A) is correct but Reason (R) is not correct, corresponding to option (C).