Question

Prolonged estrus sign in cattle is seen in

• A. Cystic follicle
• B. Para ovarian cyst
• C. Delayed ovulation
• D. Luteal cyst

Hint:

Bovine Ovarian Cysts:
Follicular Cyst (Thin-walled, high Estrogen) $\rightarrow$ Prolonged Estrus Nymphomania.
Luteal Cyst (Thick-walled, high Progesterone) $\rightarrow$ Anestrus.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Bovine ovarian follicular cysts (COD) maintain continuous high estradiol synthesis due to failure of the preovulatory LH surge, causing chronic persistent estrus (nymphomania).

Step 2: Detailed Explanation:
Pathophysiology of Bovine Ovarian Follicular Cysts (Cystic Ovarian Disease Nymphomania):
- A follicular cyst is defined as a thin-walled, fluid-filled ovarian structure ($> 2.5\text{ cm}$ in diameter) persisting on the ovary for $> 10\text{ days}$ in the absence of a functional corpus luteum.
- Arises from an endocrine defect where the hypothalamo-pituitary axis fails to release the preovulatory LH surge.
- The active granulosa cells of the cyst continuously secrete high levels of estrogens (estradiol), producing Prolonged, Persistent Estrus Signs (Nymphomania) characterized by continuous bulling, restlessness, vulvar edema, clear mucoid discharge, and relaxed sacrosciatic ligaments ('sterility hump').

Step 3: Final Answer:
Thus, prolonged estrus in cattle is seen in Cystic follicle, corresponding to option (A).