BullGen™ 10-Day Canine Semen Extender | Professional Chilled Semen Preservation
BullGen™ 10-Day Canine Semen Extender | Professional Chilled Semen Preservation
Preserve Motility. Protect Fertility. Ship With Confidence.
You've spent months planning this breeding. You've tested progesterone, confirmed ovulation, timed the collection — and now everything depends on what happens to the semen in the next 10 days. The extender you choose is the difference between viable sperm arriving at the female and a compromised sample that never had a chance.
BullGen™ 10-Day Canine Semen Extender is a professional-grade preservation medium formulated to keep semen viable, motile, and fertile from collection to insemination — whether you're shipping domestic or international, same-day or across the week.
What BullGen™ 10-Day Extender Does
- Preserves semen viability, motility, and fertility for up to 10 days under refrigeration
- Animal-protein-free formula eliminates contamination and pathogen transmission risk
- Antioxidants neutralize reactive oxygen species (ROS) that damage sperm DNA and membranes during storage
- Buffering agents maintain optimal pH for the duration of storage
- Reduces oxidative stress during cooling and temperature fluctuation
- Provides essential nutrients that sustain sperm energy reserves through transport
- Ready-to-use — no mixing, no dilution
Who It's For
BullGen™ 10-Day Extender is built for breeders who use chilled semen AI — whether you're the stud dog owner shipping a collection across the country, or the female owner receiving and inseminating. It's designed for:
- English Bulldog, French Bulldog, and American Bully breeders using chilled AI
- Canine reproduction vets and technicians
- Stud dog owners with regular semen shipment programs
- Breeders working with dogs in remote locations where same-day breeding isn't possible
- International semen shipments requiring extended viability
How to Use BullGen™ 10-Day Extender
- Collect semen using standard canine collection technique. Separate the sperm-rich fraction.
- Evaluate for motility and count prior to extension.
- Add BullGen™ 10-Day Extender to the collected sperm-rich fraction at your target dilution ratio (typically 1:1 to 2:1 extender:ejaculate depending on concentration).
- Gently mix by inversion — do not vortex or agitate aggressively.
- Evaluate post-extension motility before packaging for shipment.
- Package in chilled semen canister or shipping box with appropriate cooling media (Uni-Cool or equivalent). Maintain 4–5°C throughout transport.
- Inseminate on the receiving end using vaginal AI or TCI. For best results, use BullGen™ Semen Enhancer immediately before insemination.
What's Included
- BullGen™ 10-Day Canine Semen Extender — ready-to-use liquid formulation
Available in single-use and multi-use volumes. See product options above.
Frequently Asked Questions
Can I use BullGen™ 10-Day Extender with any breed?
Yes. BullGen™ 10-Day Extender is formulated for canine semen across all breeds. It is particularly popular among English Bulldog, French Bulldog, and American Bully breeders who routinely use chilled AI due to natural breeding limitations in brachycephalic breeds.
Does it really keep semen viable for 10 days?
The 10-day window reflects the maximum viability achievable under optimal conditions — consistent refrigeration at 4–5°C, proper collection, and appropriate dilution ratios. Many breeders achieve excellent motility at 5–7 days. Results vary based on the individual dog's semen quality at the time of collection.
Is it animal-protein-free? Why does that matter?
Yes. Traditional extenders often use egg yolk as a protein source, which carries a contamination risk and can introduce foreign proteins that may affect fertility in some females. BullGen™ 10-Day Extender uses synthetic alternatives, eliminating that risk entirely.
Do I need to use BullGen™ Semen Enhancer as well?
The 10-Day Extender and Semen Enhancer serve different purposes. The extender is for storage and transport. The enhancer is used immediately before insemination to maximize progressive motility at the time of breeding. Used together as part of the complete BullGen™ system, they cover the full reproductive protocol from collection to insemination.
How should I store unopened BullGen™ 10-Day Extender?
Store at 4–8°C (refrigerated) away from direct light. Do not freeze. Use before the expiration date printed on the label. Once opened, follow label instructions for storage and use-by timing.
Ready to upgrade your chilled semen protocol? The BullGen™ 10-Day Semen Extender is available now at The Dirty Bay Bully Depot — your source for professional-grade canine reproduction supplies. Questions before you order? Call or text us at (713) 992-4822.