breed a bitch on her 13th day just because you think it is her 13th day breed naturally just because you think it is easier or because you think you have a better chance breed to a stud dog if the quality of his semen is unknown waste time and money on transportation unless you believe you will get pups Take the guessing out of breeding. Know the correct day to breed. Eliminate reproductive infections. Know the quality of the semen. Save time and money.Have a 90% chance of having puppies. Using this simple system, in one hundred and seven breedings, we have a 93% conception rate, and larger than normal litter sizes. All were vaginal A. I.'s using fresh and frozen semen. How much are puppies worth to you?