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    • Rangeland Ecology & Management, Volume 60 (2007)
    • Rangeland Ecology & Management, Volume 60, Number 5 (September 2007)
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    Decreasing Forage Allowance Can Force Cattle to Graze Broom Snakeweed (Gutierrezia sarothrae) as a Potential Biological Control

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    Author
    Ralphs, Michael H.
    Wiedmeier, Randy D.
    Banks, Jeffrey E.
    Issue Date
    2007-09-01
    Keywords
    body condition
    grazing pressure
    nutrient supplement
    poisonous plants
    
    Metadata
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    Citation
    Ralphs, M. H., Wiedmeier, R. D., & Banks, J. E. (2007). Decreasing forage allowance can force cattle to graze broom snakeweed (Gutierrezia sarothrae) as a potential biological control. Rangeland Ecology & Management, 60(5), 487-497.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/643183
    DOI
    10.2111/1551-5028(2007)60[487:DFACFC]2.0.CO;2
    Additional Links
    https://rangelands.org/
    Abstract
    Broom snakeweed (Gutierrezia sarothrae [Pursh] Britt. Rusby) increases and dominates rangelands following disturbances such as overgrazing, fire, and drought. However, if cattle can be forced to graze snakeweed, they can be used as a biological tool to control it. Grazing trials were conducted in May and August 2004, 2005, and 2006 on a crested wheatgrass (Agropyron cristatum L.) seeding that had been invaded by broom snakeweed. Narrow grazing lanes were fenced with temporary electric fence and the cows were moved to a new lane each day. Forage allowance was limited to 24%-75% of the intake requirement. There were significant negative correlations (P < 0.05) between forage allowance and snakeweed utilization, suggesting it was the main factor driving snakeweed consumption. In the 2004 experiment, 7 cows in low body condition (4.6 body condition score, BCS) and 7 cows in high body condition (6.8 BCS) were grazed in separate lanes. The low body condition group grazed more snakeweed in the evening grazing period (26% of bites) than the high body condition group (20% of bites, P = 0.03). In the 2005 experiment, one group (6 cows) received a protein/energy supplement high in bypass amino acids required for detoxification of terpenes; the second group received no supplement. There was no difference in snakeweed consumption between the supplement groups (P = 0.63). The major difference in diets in both years occurred in grazing periods during the day. Cows grazed perennial bunchgrasses first, then turned to cheatgrass (Bromus tectorum L.), and grazed snakeweed only when all other forage was depleted (20% of bites in the evening grazing periods). Cattle grazed 62%-95% of snakeweed plants and utilized 50%-85% of snakeweed biomass. Cattle can be forced to graze snakeweed by confining them to small areas and limiting alternative forage. Grazing reduced the snakeweed population. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/1551-5028(2007)60[487:DFACFC]2.0.CO;2
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 60, Number 5 (September 2007)

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