Question

White heifers' disease is associated with

• A. Cystic ovary
• B. Uterus unicornis
• C. Ovarian hypoplasia
• D. Para ovarian cyst

Hint:

White Heifer Disease: Congenital Segmental Aplasia of Müllerian (Paramesonephric) Ducts $\rightarrow$ Uterus unicornis, persistent imperforate hymen, hydrometra. Ovaries are normal.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Congenital Müllerian duct segmental aplasia (White Heifer Disease) in homozygous white Shorthorn cattle causes developmental arrest of the paramesonephric ducts.

Step 2: Detailed Explanation:
White Heifers' Disease (Segmental Aplasia of Paramesonephric Müllerian Ducts):
- A sex-linked hereditary developmental defect linked to the gene for white coat color ($r / r$ recessive genotype) in white Shorthorn and Belgian Blue cattle.
- The ovaries and vulva are normal, but variable segments derived from the embryonic paramesonephric ducts fail to develop or canalize.
- Pathological manifestations include Uterus unicornis (complete absence/aplasia of one uterine horn), persistent hymen, segmental vaginal aplasia, and proximal fluid retention (mucometra/hydrometra).

Step 3: Final Answer:
Therefore, White heifers' disease is associated with Uterus unicornis, corresponding to option (B).