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A Comparison of the Abortifacient Risk of Western Juniper Trees in OregonOn the Ground • The bark, leaves, and berries of western juniper trees in Oregon can cause abortions in late-term pregnant cattle. • The percentage of the abortion-causing compounds varied from tree to tree in a location, as well as between locations across Oregon, but did not appear to vary across time. • Cattle producers who winter cattle in pastures with western juniper trees should take cautions such as denying late-term pregnant cattle access to these pastures, providing adequate feed and shelter, maintaining pregnant cattle in good body condition, changing calving schedules to late spring or early fall, and, if abortions do occur, seeking veterinary care for any postpartum complications.
Evaluation of the Seasonal and Annual Abortifacient Risk of Western Juniper Trees on Oregon RangelandsOn the Ground • Western juniper trees can cause late term abortions in cattle, similar to ponderosa pine trees. • Results from this study demonstrate that there is no difference in the labdane acid (the abortifacien tcompounds) content of western juniper trees throughout the year, or from year to year. • Consequently the abortifacient risk of western juniper trees should not vary throughout the year, or from year to year. • Producers who winter cattle in rangelands with western juniper trees should take similar precautions to prevent late term abortions as they would with ponderosa pine trees.