• Comparative Ejaculate Volumes:
• Boar: Characterized by massive ejaculate volume of $150 - 300\text{ ml}$ (up to 500 ml).
• Stallion (Horse): High volume of $50 - 100\text{ ml}$.
• Dog: Volume typically ranges from $5 - 20\text{ ml}$ (including presperm, sperm-rich, and prostatic fractions).
• Bull: Concentrated, low volume of $4 - 8\text{ ml}$.
• Ram: Highly concentrated, very low volume of $0.8 - 1.2\text{ ml}$.
• Descending Sequence of Ejaculate Volume:

• nalysis:
• (Boar> horse> dog> bull): Correct sequence.

Correct option: (3) Boar> horse> dog> bull

• Mechanisms of Ovulation in Mammals:
• Reflex / Induced Ovulators: Ovulation does not occur spontaneously at the end of the follicular phase; mechanical coital stimulation of vaginal/cervical sensory mechanoreceptors is strictly required to trigger a neuroendocrine surge of GnRH and LH.
• Examples: Cat (Queen), Rabbit (Doe), Camel (Camelus), Ferret, Mink.
• Spontaneous Ovulators: Cyclic rising levels of follicular estradiol trigger the pre-ovulatory LH surge and ovulation independently of copulation:
• Examples: Dog (Bitch), Cow, Mare, Ewe, Sow, Human.
• nalysis:
• (Dog): Correct (spontaneous ovulator, not a reflex ovulator).

Correct option: (2) Dog

• Historic Cloned Mammals:
• Cloned Sheep:
• Dolly (1996): First mammal cloned from adult somatic cells.
• Megan and Morag (1995): First cloned sheep from differentiated embryonic cell lines.
• Polly (1997): First transgenic cloned sheep bearing human factor IX gene.
• Xena (2000):
• The world's first cloned pig (porcine), produced from adult granulosa cells via SCNT.
• nalysis:
• (Xena): Correct (Xena is a cloned pig, not a sheep).

Correct option: (2) Xena