There is an alternative to surgical implants being used/tested by two Theriogenologists at a Veterinary college in the midwest. It is a Vaginal AI done with a catheter that has an inflatable cuff which seals the vagina to prevent leakage. The thawed semen is injected through the catheter and then 6 ml of the same extender in the semen is injected behind the semen. This forces the semen well into the uterus to reach the ovaducts much like an implant without the need for surgery. The catheter is left inflated for 15 minutes to simulate a natural tie. The bitch is manually stimulated during the entire procedure to induce contractions to help move the semen as well. They have done the procedure 8 times with frozen semen producing 7 litters. The one failure involved very poor semen. They performed this procedure for me using chilled semen 6 months ago resulting in a litter of 10 puppies. You must of coarse do progesterone testing to pinpoint the surge and ovulation. Smears and vaginoscopies were also done to confirm time to inseminate. It is a simple procedure and is cheaper and safer to do. Unlike a transcervical insemination(TCI) which just deposits the semen at the cervix this procedure moves the semen well into the uterus. In a natural tie the sperm is produced first and then a larger volume of prostatic fluid is ejaculated forcing the sperm into the uterus. This procedure does the same thing. We had to inseminte the chilled semen a day early due to the male running a field trial. The semen was collected on a Thursday and inseminated 24 hours later although the eggs were not ready until Saturday. These two Vets will publish their results after twenty frozen vaginal inseminations are done. With Kent Law 4 hours away they do not get much demand for this. I just had them freeze some semen and will use it to help them finish their research. I can provide written reports from the procedure to those interested.