inoculation in treated mares compared with control mares. These data indicate that estrone sulfate was not a useful biomarker for acute placentitis in mares, whereas 17-estradiol sulfate decreased pre- cipitously in mares subsequent to experimental in- duction of ascending placentitis.
Acknowledgments
This research was supported by the Albert G. Clay Endowment in equine reproduction, by the Depart- ment of Veterinary Science, and by the Geoffrey Hughes Fellowship at the University of Kentucky.