Kinda a long post, but here is the info from the Therio site.
q 1. Through the standard route, a candidate shall have completed at least one (1) year of clinical practice, or its equivalent, subsequent to attainment of a veterinary medical degree, and completed a minimum of two (2) years in an established / supervised training program which includes experience in teaching, research, and/or practice of theriogenology. This training program shall be completed following attainment of a veterinary medical degree. This training program shall include a Diplomate of either the American College of Theriogenologists or European College of Animal Reproduction, or a Fellow of the Australian College of Veterinary Scientists (Animal Reproduction).
q 2. In the alternative route, to be eligible to sit for the examination, an individual lacking formal advanced training shall have a minimum of six (6) years of practice experience with a major emphasis in theriogenology, including successful completion of a 2-year pre-approved study and mentorship program. This study and mentorship program shall include a Diplomate of either the American College of Theriogenologists or European College of Animal Reproduction, or a Fellow of the Australian College of Veterinary Scientists (Animal Reproduction). The potential candidate may apply to take the Certifying Examination two (2) years after the onset of approval of the program of study and must apply within four (4) years of approval of the program of study.