• Unique Endocrinology of the Bitch (Canis lupus familiaris):
• In most domestic mammals (cow, ewe, mare, sow), luteinization of follicular granulosa cells occurs strictly post-ovulation under the influence of the LH surge.
• In the Bitch:
• Follicular granulosa cells undergo extensive pre-ovulatory luteinization $24 - 48\text{ hours}$ before ovulation in response to the initial rise in baseline LH.
• This causes circulating plasma progesterone levels to rise significantly ($\gt 2\text{ ng/ml}$) prior to follicular rupture, serving as the definitive clinical indicator for timing breeding and artificial insemination.
• nalysis:
• (Bitch): Correct.

Correct option: (4) Bitch