Artificial Insemination in Dogs: Fresh, Chilled, and Frozen Semen Guide

Artificial insemination (AI) has transformed dog breeding. It allows breeders to use studs who live across the country or world, breed females with anatomical challenges, work with frozen semen from dogs who died years ago, and time breedings with precision.

Why Use Artificial Insemination?

AI is used when: the stud and dam are geographically separated, the stud has died but banked frozen semen is available, natural breeding is not possible, or progesterone-timed precision is important.

AI with precise timing often produces larger litters than natural breedings with approximate timing.

The Three Types of Semen

1. Fresh Extended Semen (Same-Day AI)

Semen collected and used immediately or within 60 minutes. Most reliable for AI. Conception rates are equivalent to natural breeding when timing is correct.

2. Chilled (Refrigerated) Semen

Semen extended with a protective fluid, chilled to 4 degrees C, and shipped overnight for use within 24-72 hours. Maintains 50-70% or more of original motility. Conception rates with chilled semen: 70-80% or higher with good quality and correct timing.

Logistics: Stud owner coordinates collection and packaging at a reproductive vet. Shipped in insulated container via overnight courier. Dam owner brings it immediately to their reproductive vet for insemination.

3. Frozen Semen (Cryopreserved)

Semen cryopreserved in liquid nitrogen at -196 degrees C and stored indefinitely. Used for international breedings, using genetics from deceased dogs, and long-term banking.

The tradeoff: Freezing significantly reduces post-thaw motility (80% fresh may show 30-40% after thawing). Frozen semen must be used with more targeted insemination techniques (TCI or surgical).

The Three Methods of Semen Deposition

1. Vaginal Insemination (VI)

Simplest method. Catheter deposits semen near the cervix. Best for fresh extended semen. Not recommended for frozen semen.

2. Transcervical Insemination (TCI)

Endoscope passed through vagina to visualize cervix; catheter passed through cervix to deposit semen directly into uterus. No surgery required. Best for chilled and frozen semen. Conception rates with frozen semen plus TCI: 60-80% in experienced hands.

3. Surgical Insemination

Small surgical incision in abdomen; semen injected directly into each uterine horn. Requires general anesthesia. Less common now that TCI is widely available.

Timing Is Everything

The ideal timing for AI:

• Fresh/vaginal AI: 2 days post-LH surge (progesterone 4-10 ng/mL), repeated 48 hours later if possible
• Chilled semen/TCI: Same timing as fresh
• Frozen semen/TCI or surgical: 3-4 days post-LH surge when eggs are fully mature

Logistics for Chilled Semen Shipping

1. Dam owner confirms progesterone timing with reproductive vet
2. Stud owner notified 24-48 hours before needed collection date
3. Stud owner schedules collection at reproductive vet
4. Semen collected, evaluated, extended, and packaged
5. Shipped overnight via FedEx or UPS
6. Dam owner brings container immediately to reproductive vet for insemination
7. Second AI performed 24-48 hours later if possible

Summary

Fresh semen vaginal AI is simplest. Chilled semen with TCI offers the best balance for geographically separated breedings. Frozen semen with TCI or surgical AI allows use across any distance and time. Progesterone-guided timing is the most important factor in AI success.