Question

Which of the following animals is an induced ovulator?

• A. Buffalo
• B. Cattle
• C. Rabbit
• D. Goat

Hint:

Ovulation Types:
Induced Reflex Ovulators = RABBIT, Queen (Cat), Camel, Ferret, Llama.
Spontaneous Ovulators = Cow, Buffalo, Goat, Ewe, Mare, Sow.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Comparative neuroendocrine ovulatory mechanisms: spontaneous ovulators (cow, ewe, goat, sow) vs reflex/induced ovulators (rabbit, cat, camel, ferret).
Key Formula or Approach:
\[ \text{Coital Vaginal Stimulation} \xrightarrow{\text{Neuroendocrine Reflex}} \text{Hypothalamic GnRH Release} \longrightarrow \text{LH Surge} \implies \text{Induced Ovulation} \]

Step 2: Detailed Explanation:
Ovulatory classification across mammalian species:
1. Induced (Reflex) Ovulators (Rabbit, Cat, Camel, Ferret, Mink): Do not undergo spontaneous preovulatory LH surges. Ovulation is strictly triggered by coital mechanical stimulation of the vagina/cervix during mating (or ovulation-inducing factor [OIF/$eta$-NGF] in seminal plasma), which initiates a neuroendocrine reflex through the spinal cord to the hypothalamus, releasing GnRH and an LH surge that induces ovulation $10 - 12\text{ hours}$ post-coitus.
2. Spontaneous Ovulators (Cattle, Buffalo, Goat, Sheep, Pig): Undergo cyclical ovarian follicle maturation and spontaneous estrogen-positive feedback LH surges regardless of mating.

Step 3: Final Answer:
Hence, Rabbit is an induced ovulator, corresponding to option (C).