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    • Rangeland Ecology & Management, Volume 64 (2011)
    • Rangeland Ecology & Management, Volume 64, Number 6 (November 2011)
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    Cattle Grazing Toxic Delphinium andersonii in South-Central Idaho

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    Author
    Pfister, James A.
    Cook, Daniel
    Gardner, Dale R.
    Issue Date
    2011-11-01
    Keywords
    alkaloids
    diet
    larkspur
    livestock
    poisonous plants
    
    Metadata
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    Citation
    Pfister, J. A., Cook, D., & Gardner, D. R. (2011). Cattle grazing toxic Delphinium andersonii in south-central Idaho. Rangeland Ecology & Management, 64(6), 664-668.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642914
    DOI
    10.2111/REM-D-11-00001.1
    Additional Links
    https://rangelands.org/
    Abstract
    Anderson larkspur (Delphinium andersonii A. Gray) is a toxic plant responsible for cattle death losses in the western United States. The objectives of the present study were to determine when cattle consumed Anderson larkspur in relation to plant phenology and toxicity, and to determine if animal age influenced selection of Anderson larkspur. These grazing studies were conducted on semiarid sagebrush rangeland near Picabo, Idaho. Eight 6-7-yr-old mature Angus cows were used in 2008, whereas during 2009, 12 Angus cattle were used, including six yearling heifers and six 4-yr-old cows. The overall density of Anderson larkspur was 2.8 plants m-2 during 2008, and 4.9 plants m-2 during 2009. Total toxic alkaloid concentrations in Anderson larkspur plants were near or above 5 mg g-1 during both studies. During 2008 consumption peaked during the late flower and pod stage of growth. Overall in 2008 cows ate 3% of their bites as larkspur. During 2009 heifers ate about twice as much Anderson larkspur as did mature cows (5.1% of bites vs. 2.9%, respectively). Heifers repeatedly consumed sufficient larkspur that they collapsed; however, no animals were fatally intoxicated. Heifers appeared to become transiently averted to larkspur; however, heifers resumed consumption of D. andersonii after a period of one to several days of low or no consumption. Livestock management to reduce losses to Anderson larkspur should include timed grazing to avoid infested pastures during full flower to pod phenological stages, and grazing with older animals rather than yearling heifers.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-11-00001.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 64, Number 6 (November 2011)

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