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.