Question

Estrous cycle is interrupted by :

• A. Anestrus
• B. Proestrous
• C. Metestrous
• D. None of the above

Answer 1

Answer: (A)

Anestrus

• Anestrus is a state or interval of sexual inactivity between periods of activity in periodically breeding mammals.
• The first phase (proestrus) of the estrous cycle is the building-up phase. During this phase the ovarian follicle (under the influence of FSH and LH) enlarges and begins to secrete estrogens.
• The end of sexual receptivity marks the beginning of metestrus, the post-ovulatory phase dominated by corpus luteum function.
  
• So, the correct option is 'Anestrus'.