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Thomas W Geary

Research Animal Scientist

Dr. Tom Geary

Research Animal Scientist
Reproductive Physiologist

243 Fort Keogh Road
Miles City, MT 59301-4016
Phone: (406)874-8215
Fax: (406)874-8289


Biographical Information:

Tom conducts research to improve reproductive efficiency in beef cattle. The goal of this research is to identify tools to improve calving distribution management. Research includes factors affecting postpartum anestrus recovery, pubertal transition, and pregnancy establishment and maintenance early in the breeding season. This research also focuses on understanding early embryonic loss and applications that minimize these losses. Collaborative research includes collection of various phenotypic traits involved in fertility of both bulls and cows to lead toward gene discovery of fertility markers.

Educational Background:

  • BS - Animal Science - Montana State University, 1985
  • MS - Animal Science - Washington State University, 1989
  • PhD - Animal Science - Washington State University, 1993



Fort Keogh Publications
(look here for downloadable .pdf files)

Current Research Projects:

  • Evaluating mechanisms involved in pregnancy establishment and maintenance
  • Evaluating new measures of fertility and mechanisms affecting fertility in beef bulls. 
  • Identifying phenotypic and genomic markers of fertility in beef cattle.

USDA, ARS Fort Keogh Livestock and Range Research Laboratory
243 Fort Keogh Rd., Miles City, MT  59301-4016
Phone: 406-874-8200, Fax:  406-874-8289