HEATHER SMITH THOMAS
Over the years, several pregnancy tests have been developed using hormone measurements on an animal’s blood or by testing the milk. The one most commonly used today is a blood test developed by Dr. Garth Sasser at University of Idaho. In his research he discovered a protein produced by the placenta of ruminant animals, detectable in their blood. He founded a company called BioTracking; his blood test called BioPRYN (Pregnant Ruminant Yes/No) for cattle, sheep, goats, and other ruminants became commercially available in 2002. There are now 25 labs around the world that handle the blood samples.