Blood Python Breeding Records: A Complete Documentation Guide

Blood pythons (Python brongersmai) are one of the most rewarding pythons to breed, but they require a different approach than ball pythons. Heavier bodied, more defensive in some individuals, and with their own distinct breeding timeline, blood pythons reward breeders who pay close attention and keep detailed records.

Blood Python Breeding Biology

Blood pythons are native to the Malay Peninsula, Sumatra, and nearby islands. They experience a less dramatic seasonal variation than ball pythons, which means breeding triggers are somewhat subtler and individual animals can vary in their response to cycling protocols.

Breeding season: Most breeders in the northern hemisphere cycle blood pythons from October through February, with pairings primarily October through January. Eggs are typically laid February through April. At blood python incubation temperatures, hatching occurs July through September.

Clutch size: Blood python clutches average 10-16 eggs, with productive females producing 18-20 or more. First-time breeding females typically produce smaller clutches.

Incubation: Blood pythons incubate cooler than ball pythons. Most experienced breeders target 84-86F, with 85F being common. At this temperature, incubation takes 75-90 days. Higher temperatures can produce faster development but carry increased deformity risk.

Pre-Season Records

Before the breeding season, document every breeding candidate's status:

• Weight: female blood pythons should generally be 1,500-2,000g minimum before breeding, with larger females preferred
• Body condition: blood pythons can carry significant fat deposits, assess body condition not just weight
• Last feeding and shed dates
• Previous breeding history

Pairing Records

Blood python introductions require more caution than ball python pairings. Blood pythons can be defensive, and some females are aggressive toward males. Supervised introductions are preferable, especially with animals you haven't paired before.

Record every introduction:

• Date
• Female ID and male ID
• Duration
• Lock observed (yes/no)
• Behavior notes: was the female receptive, defensive, or aggressive? Was the male actively pursuing or disinterested?
• Date male was removed

Blood python males may need extended rest periods between introductions due to the physical demands of breeding these larger, heavier animals.

Ovulation and Pre-Lay Records

Blood python ovulation presents similarly to ball python ovulation: a mid-body swelling that lasts 24-48 hours. It can be subtle in heavier-bodied individuals. Check gravid females daily during the pairing period.

After ovulation, the pre-lay shed occurs approximately 30-45 days later (somewhat more variable than in ball pythons). Egg laying follows approximately 30-40 days after the pre-lay shed.

Document:

• Date of observed ovulation (or estimated ovulation based on pre-lay shed)
• Date of pre-lay shed
• Calculated lay date window
• Calculated hatch date window

Clutch Records

When eggs are laid, document immediately:

• Lay date
• Total egg count and fertile vs. slug count
• Individual egg weights if possible (blood python eggs are large, 80-130g each)
• Total clutch weight
• Female post-lay weight and condition assessment
• Incubation setup: container type, substrate type and ratio, temperature target, humidity target

Blood python eggs are particularly large and benefit from careful humidity management. Many breeders use perlite or hatchrite substrate slightly on the dry side compared to ball python incubation, as blood python eggs can be susceptible to absorbing excess moisture.

Incubation Logs

Check eggs weekly. Document temperature and humidity at each check, along with any egg changes. Blood python eggs develop visibly, you can see the embryo mass through the shell at certain stages, and healthy eggs gain a slight pinkish tone as development progresses.

Any eggs that show early signs of death (yellowing, collapsing, fungal growth) should be removed promptly to protect viable eggs.

Hatch Records

Blood python hatchlings are large compared to ball python hatchlings, typically weighing 80-130g at birth. They are often more defensive from hatching than ball pythons and may take several meals before becoming reliably feed-trained.

Document at hatch:

• Pip date and full hatch date
• Individual hatchling weights and morph identification
• Physical notes

HatchLedger connects blood python clutch records to individual hatchling records the same way it does for ball pythons, making the transition from incubator to hatchling inventory seamless.

Related content: Blood Python Record Keeping | Blood Python Cycling Guide | Clutch Hatch Tracking

Sources

• Reptile and Amphibian Ecology International
• Association of Reptilian and Amphibian Veterinarians (ARAV)
• Blood python community (Fauna Classifieds, MorphMarket)