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United States Department of Agriculture

Agricultural Research Service

James A Pfister (Jim)






Poisonous Plant Research Lab

1150 E 1400 N

N Logan, UT 84341








    1983    PhD     Range Animal Nutrition; Utah State University

    1979      MS       Range Science; New Mexico State University

    1977      BS       Animal Science; Utah State University




  Delphinium andersonii, Picabo Idaho

  Horses eating locoweed in Arizona

Cattle browsing on ponderosa pine needles in South Dakota

  Cattle eating lupine in eastern Washington

Research Interests

Plant animal interactions involved in consumption of toxic plants. Effects of toxic plant consumption on animal behavior. Nutritional status of grazing animals and effects on consumption of poisonous plants. Grazing management of livestock to reduce risk of losses to poisonous plants.


Significant Accomplishments


  • Developed grazing management recommendations for cattle on tall larkspur infested rangelands
  • Determined relationship between toxicity and palatability in larkspurs, and elucidated cyclic consumption patterns of larkspurs by cattle
  • Determined impacts of cattle body condition and nutritional status on pine needle ingestion by cattle
  • Determined effects of locoweed on maternal/offspring behaviors

Last Modified: 8/12/2016
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