Dog Progesterone Levels
Why Are Dog Progesterone Levels Important in Breeding?
When breeding dogs, timing is critical. Progesterone testing helps pinpoint the ideal mating window, ensuring sperm and eggs meet at the right time for conception. In dogs, progesterone levels rise before ovulation and remain elevated throughout pregnancy. Understanding these patterns helps breeders schedule natural mating, artificial insemination, or even elective C-sections with precision.
What Is Progesterone and How Does It Affect Fertility?
Progesterone is a reproductive hormone produced by the ovaries. Its role is to prepare and maintain the uterus for pregnancy. In the canine reproductive cycle, progesterone:
- Rises just before ovulation
- Remains high during pregnancy
- Supports embryo implantation and development
Dogs differ from many mammals — they ovulate as progesterone rises and estrogen declines. This means progesterone testing is more reliable than behaviour alone when identifying the fertile period.
How Are Dog Progesterone Levels Tested?
Progesterone testing involves a blood sample analysed in a veterinary or human laboratory. Many clinics use in-house equipment such as the Immulite, Tosoh, Mini-Vidas, or MicroVet Cube.
Results are usually available within 24 hours. Units can be reported in ng/ml (nanograms per millilitre) or nmol/L (nanomoles per litre) — to convert, multiply ng/ml by 3.18.
What Are Normal Dog Progesterone Levels?
Typical ranges in nmol/L from IDEXX laboratory:
- Anestrus (not in heat): < 3 nmol/L (< 1.2 ng/ml)
- Late Proestrus: 6–8 nmol/L (2.4–3.2 ng/ml)
- Luteinizing hormone (LH) surge: 8–12 nmol/L (3.2–4.8 ng/ml)
- Ovulation: 12–24 nmol/L (4.8–9.6 ng/ml)
- Post-Ovulation: > 24 nmol/L (> 9.6 ng/ml)
In ng/ml, baseline levels are < 1.0 ng/ml until just before the LH surge. Ovulation generally occurs around 5 ng/ml.
When Should You Start Progesterone Testing?
Begin testing around day 5–6 of the heat cycle. Continue every 2–3 days until levels indicate the LH surge and ovulation. The fertile window can then be calculated based on semen type:
- Natural breeding or immediate Artificial Insemination: 3 days after 2.5 ng/ml
- Fresh chilled semen: 4 days after 2.5 ng/ml or 48 hours after 5 ng/ml
- Frozen semen: 5 days after 2.5 ng/ml or 72 hours after 5 ng/ml
Can You Breed Too Early or Too Late?
Yes. Eggs take around 48 hours after ovulation to mature. Breeding too early means sperm may die before eggs are ready. Breeding too late reduces the chance of conception, especially with semen types that have shorter viability (frozen semen survives less than 24 hours). If using Artificial Insemination, many breeders have 2 rounds of AI to ensure the best chance of successful breeding.
How Do Vaginal Cytology and Progesterone Testing Work Together?
Vaginal cytology examines cells from the vaginal lining under a microscope to identify the stage of the heat cycle. While useful for narrowing the window, progesterone testing offers exact hormonal confirmation, making them best used together for accurate timing.
How High Should Progesterone Be to Confirm Ovulation?
Ovulation typically occurs at 5 ng/ml, but final inseminations are often timed when levels reach or exceed 20 ng/ml to ensure ovulation is complete and hormone levels can maintain a pregnancy.
Can Progesterone Testing Predict Whelping Dates?
Yes. Once ovulation is confirmed, whelping generally occurs 63 days later. Knowing the ovulation date also helps breeders plan elective C-sections at the safest time for both the dam and the puppies.
Final Tips for Breeders
- Combine progesterone testing with behaviour observation and cytology for accuracy
- Keep previous heat cycle records for better predictions
- Perform pre-breeding health checks, including thyroid testing
- Work closely with a vet experienced in canine reproduction
Responsible Pet Breeders Australia equips members with everything they need before breeding begins. From comprehensive breeder templates covering contracts, health checks, and mating agreements, to access to both our private and public stud directory, you can confidently find and connect with the most suitable stud for your breeding program. Start your breeding journey with the right tools, trusted resources, and a supportive community. Join RPBA today and breed with confidence.
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