Unusual and abnormal canine estrous cycles

Area of Science:

• Veterinary Medicine
• Reproductive Biology
• Canine Reproduction

Background:

• Preovulatory serum progesterone concentrations are vital for accurately determining the LH peak (day 0).
• This measurement aids in precise insemination timing and parturition prediction in bitches.
• It is also essential for identifying abnormal estrous cycles stemming from ovarian dysfunction.

Purpose of the Study:

• To review common estrous cycle abnormalities in the bitch.
• To discuss the implications of these dysfunctions for reproductive outcomes and canine health.
• To highlight the importance of early identification and management of ovarian disorders.

Main Methods:

• This is a review article, synthesizing existing knowledge on canine estrous cycle abnormalities.
• It focuses on conditions such as anovulation, slow preovulatory progesterone rise, split heat, insufficient luteal phase, and persistent estrus.
• The review examines the diagnostic and prognostic significance of serum progesterone levels.

Main Results:

• Anovulation, slow preovulatory progesterone rise, split heat, insufficient luteal phase, and persistent estrus represent key ovarian dysfunctions.
• Some dysfunctions are temporary, allowing pregnancy with appropriate breeding management.
• Other cases indicate severe, permanent ovarian dysfunction, leading to infertility and potentially life-threatening conditions.

Conclusions:

• Accurate assessment of preovulatory progesterone is critical for diagnosing and managing canine reproductive disorders.
• Early identification of ovarian dysfunction can lead to therapeutic interventions, improving pregnancy rates.
• Understanding these cycles is essential for both the therapeutic and economic aspects of canine reproduction.