Individual mare PSDs were recovered at rates of 95% and 92% from horses on the NY and PA farms respectively, showing that this adaptation of PSDs is robust enough to withstand the equine environment.  Chemical analysis for PAHs on mare-deployed PSDs resulted in quantitative identification of 60 individual PAHs. Continued analysis of biological samples from each mare-foal pair and analysis of PSDs could reveal environmental stressors associated with this negative health outcome in a mammal model.