Following up on our Blog article of last month Should the US Adopt Stricter Controls on Cooled and Frozen Semen Production Facilities, we thought it might be interesting to present some data to demonstrate the variability in the quality of frozen semen being imported into the US. For the purposes of this blog article we combined the data from client samples submitted for post-thaw analysis in the last 1-3 yrs. A post-thaw analysis is one of the services we offer to our clients importing frozen semen; we evaluate post-thaw motility by computer assisted sperm analysis (CASA), sperm concentration using the Nucleocounter and we perform a bacterial culture of the semen to check for mare pathogens.