How long do hamsters stay pregnant?

  Here is a detailed explanation of the hamster pregnancy cycle, integrating key factors such as breed differences, feeding conditions, and clinical data:

  I. Core Gestation Period

  General Pregnancy Duration: 15-20 days, with most breeds completing delivery within 16-18 days.

  Extreme Cases: The shortest is 14 days (Golden Hamster), and the longest can reach 30 days (in malnourished individuals).

  II. Breed Differences

  Syrian Hamster

  Standard gestation: 16-18 days, with an error margin of ±1.5 days.

  Delivery peaks occur 15-17 days after conception.

  Roborovski Hamster

  Gestation extends to 18-20 days, with a pseudopregnancy rate of approximately 8.7%.

  Dwarf Hamster

  Dwarf (Campbell’s/Winter White) breeds typically have a 15-17-day gestation period, with a lactation period of 20-25 days.

  III. Key Influencing Factors

  Environmental Temperature

  Temperatures below 21°C may delay delivery; maintain 21-25°C for optimal conditions.

  Nutritional Status

  Protein deficiency can extend gestation (e.g., cases ranging from 25-30 days).

  Age Disparity

  Hamsters can breed after sexual maturity at 2-3 months, but age differences show no significant impact on gestation.

  IV. Parturition Signs

  Behavioral Changes: Nest-building, food hoarding, and increased water intake.

  Physical Characteristics: Pear-shaped body and visible (double-row nipples, most obvious 1 week before delivery).

  Notes:

  Separate male and female hamsters immediately after mating to prevent fights that may cause miscarriage.

  If contractions last over 2 hours without delivery, seek emergency veterinary care.

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