Most missed OEB breedings are timing failures, not genetic incompatibility. The bitch was bred too early, too late, or based on visual cues alone. Progesterone testing turns a guess into a number; the difference is roughly 30 percentage points of conception rate. Any serious OBBA breeder uses progesterone testing on every breeding, full stop.
The OEB heat cycle follows the standard canine pattern with no breed-specific peculiarities. What is breed-specific is the increased reliance on accurate timing because of how AI is sometimes used (chilled or frozen for distance breedings) and how c-section probability scales with the litter size that good timing produces.
Honest framing. Visual cues alone (swelling, color of discharge, behavior with the stud) miss the optimal breeding window in roughly 25 to 40 percent of bitches. Progesterone testing brings that miss rate to under 5 percent. The $300-$800 spent on testing is the cheapest insurance in any breeding program.
The four phases of a heat cycle
- Proestrus (days 1-9 typical, range 3-17): swelling, bloody discharge, scent attracts males but the bitch refuses cover. Estrogen rising, progesterone still low. No breeding window yet.
- Estrus (days 5-13 typical, range 3-21): discharge lightens to straw-color, vulva remains swollen but softens, bitch becomes receptive (flagging, standing for the stud). Estrogen drops, LH surge triggers ovulation, progesterone climbs. This is the breeding window.
- Diestrus (days 14-90): if bred, this is pregnancy. If not bred, the bitch returns to a non-receptive state with progesterone still elevated. Pregnancy and false pregnancy look similar hormonally.
- Anestrus (days 90-180+): rest period before the next heat. Most OEBs cycle every 6 to 9 months, with seasonal variation.
Day-counting from the first sign of bloody discharge is unreliable. Some bitches show a 5-day proestrus, some show a 17-day proestrus. The actual breeding window is locked to the LH surge, not to the calendar.
Progesterone testing
Progesterone is the hormone that confirms ovulation and locks down the breeding window. Most clinics in the US and Canada offer in-clinic progesterone tests with same-day or next-day results. Cost runs $80 to $200 per test, with most bitches needing 3 to 6 tests across the cycle.
The reference values most reproductive vets use:
| Progesterone (ng/mL) | Stage | Action |
|---|---|---|
| 0.5-1.0 | Pre-LH surge | Continue testing every 2-3 days |
| 2-3 | LH surge, ovulation 24-48 hours away | Test daily or every other day |
| 5-8 | Ovulation just occurred | Eggs need 48 hours to mature; breeding window opens 2 days from now |
| 10-30 | Optimal breeding window | Breed: live cover or AI |
| 30+ | Past peak | Breeding window narrowing; chilled or frozen AI must be perfectly timed |
The optimal breeding window for live cover and chilled semen is typically days 4 to 6 past the LH surge (progesterone 10-30). Frozen semen has a tighter window (days 5-6 past LH surge) because the sperm has reduced longevity.
Practical testing schedule
For a typical OEB heat cycle, the testing pattern looks like:
- Day 1 of bloody discharge: note the date. This is heat day 1.
- Day 5-7: first progesterone test. If under 1.0, schedule next test 2-3 days out.
- Day 8-9: second test. Look for the LH surge marker (2-3 ng/mL).
- Day 10-12: daily testing once progesterone hits 5+. Plan the breeding date based on the trajectory.
- Day 12-15 typical: optimal breeding window opens.
Some bitches surge as early as day 7. Some surge as late as day 18. The schedule above is a starting framework; actual testing should follow the bitch's own progression.
Live cover, chilled AI, frozen AI
- Live cover. The bitch travels to the stud (or vice versa) and the stud breeds her naturally. Two to three breedings 24-48 hours apart during the optimal window. Highest conception rate (~85%). Requires bitch to travel to a stud geographically reachable.
- Chilled AI (transcervical or surgical). Stud collects, semen ships overnight in extender at refrigeration temperature, vet inseminates the bitch on arrival. Conception rate around 70-80% with good timing. Allows access to studs anywhere shipping reaches.
- Frozen AI. Stud collects (sometimes years before), semen frozen and stored. Vet thaws and inseminates surgically (best results) or transcervically. Conception rate around 60-75% depending on protocol and timing. Allows access to deceased studs or cross-continental studs but is the lowest-margin method on timing.
Multiple breedings within the window
Standard practice for live cover: breed twice or three times across the optimal window, typically 24-48 hours apart. Sperm survives 2-5 days in the bitch's reproductive tract; the eggs are viable for ~48 hours after ovulation. Multiple breedings increase the probability that viable sperm and viable eggs overlap.
For chilled AI, two inseminations 48 hours apart in the optimal window is standard. For frozen AI, a single timed insemination is the norm because of cost.
Confirming pregnancy
- Day 25-30 post-breeding: palpation by an experienced vet can sometimes detect implanted embryos. Less reliable than ultrasound.
- Day 28-35: ultrasound. The most reliable early-pregnancy confirmation. Detects fetal heartbeats and can give a rough count.
- Day 30-35: blood relaxin test. Detects pregnancy-specific hormone, confirms pregnancy but does not give a count.
- Day 50-58: x-ray. Most accurate puppy count and skull-size assessment for c-section planning.
When not to breed
- The bitch is on her first heat (skeleton not finished, hormone profile not stable; OBBA recommends waiting until 24+ months in most cases)
- The bitch is over 6 years old and has never been bred (first-time breeding gets harder with age; talk to a reproductive vet)
- Last litter was less than 12 months ago (let her recover for at least one full heat cycle)
- Active infection (vaginal, urinary, brucellosis-positive)
- Recent surgery (any abdominal surgery within 12 months)
- Significant weight gain or loss (within 10% of optimal weight at breeding)
- Behavioral changes that suggest stress (new home, new dogs, recent loss)
Typical timing costs for one breeding
- 4 to 6 progesterone tests at $80-$200 each: $320-$1,200
- Brucellosis test (required by most stud owners): $80-$150
- Vaginal cytology (some clinics include): $40-$80
- Ultrasound at day 30: $100-$200
- X-ray at day 55: $150-$300
- Total testing budget for a single breeding: $700-$1,900