Time the breeding with progesterone — not guesswork.
Plot the progesterone curve, catch ovulation and the LH surge, and get a breeding-day window tuned to your semen type — natural, fresh, chilled, or frozen. In ng/mL or nmol/L, free to start.
Heat cycle + progesterone tracking are free. Always confirm timing with your repro vet.
Read the curve, breed on the day.
Plot the progesterone rise
Log each serial progesterone draw and BreedTools charts the curve with the fertile-window zones marked — under 2 ng/mL baseline, ~5 around ovulation (eggs mature roughly 48 hours later), the ~10–25 fertile window, and the close. Enter values in ng/mL or nmol/L (it converts at ÷3.18), so it matches whatever your lab reports.
Timing tuned to the semen type
The best breeding day is not one-size-fits-all — natural cover, fresh, chilled, and frozen AI each want a different point on the curve, with frozen needing the tightest window. BreedTools factors the insemination method into the recommendation, and watches for the LH surge.
The whole heat cycle in view
Four-phase heat tracking with next-cycle predictions feeds the timing, so the progesterone picture sits in the context of where she is in her season — not floating on its own.
Timing questions, answered.
How does progesterone timing work for breeding?
Progesterone rises in a predictable pattern through a bitch’s season. By drawing serial samples you can pinpoint ovulation and the fertile window. BreedTools charts your values against the standard zones — baseline (<2 ng/mL), the ~5 ng/mL ovulation point (eggs mature ~48 hours after), and the ~10–25 ng/mL fertile window — so you breed on the right days instead of guessing.
What progesterone level means ovulation?
On the common IDEXX-style ng/mL scale, ovulation is generally associated with progesterone around 5 ng/mL, with eggs maturing and the prime fertile window following roughly 2 days later (often ~10–25 ng/mL). Exact numbers vary by analyzer, which is why BreedTools lets you record your lab’s value and units.
Does it handle nmol/L as well as ng/mL?
Yes. Different analyzers report different units — BreedTools accepts both and converts (nmol/L ÷ 3.18 = ng/mL), so the curve is consistent no matter which lab ran the sample.
Does the timing change for frozen AI?
Yes. Frozen semen has a short viable window, so it needs tighter, later timing than natural cover or fresh AI. BreedTools accounts for the insemination method when it suggests the breeding window.
Is progesterone and heat tracking free?
Yes — heat cycle tracking and progesterone logs are on the BreedTools free plan (10 dogs, 1 active litter, no credit card). Always confirm timing with your reproductive vet; BreedTools organizes the data, it does not replace veterinary judgment.
Reference ranges are general guidance; analyzers differ. BreedTools organizes your data — your reproductive vet makes the call.
Nail the timing on the next heat.
Start logging progesterone free — chart the curve and breed on the right day.