We started using the Biopryn testing 3-4 years ago. It's extremely accurate and inexpensive compared to most methods. The drawback might be if you need sex determination at the same time. There are affiliates all across the country. http://www.biotracking.com/?q=labs
We are looking to sex as many of the calves as possible, otherwise we would just wait and have a vet sleeve them. Thanks for the reply though, I guess there must not be many techs in that neighborhood.