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    Conditioned aversion to minimize Ferula communis intake by orphaned lambs

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    Author
    Landau, S. Y.
    Ben-Moshe, E.
    Egber, A.
    Shlosberg, A.
    Bellaiche, M.
    Perevolotsky, A.
    Issue Date
    1999-09-01
    Keywords
    lithium chloride
    social facilitation
    Ferula communis
    anticoagulants
    social interaction
    flood aversion
    conditioning
    learning
    lambs
    Israel
    conditioned behavior
    grazing
    feed intake
    poisonous plants
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    Citation
    Landau, S. Y., Ben-Moshe, E., Egber, A., Shlosberg, A., Bellaiche, M., & Perevolotsky, A. (1999). Conditioned aversion to minimize Ferula communis intake by orphaned lambs. Journal of Range Management, 52(5), 436-439.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643922
    DOI
    10.2307/4003769
    Additional Links
    https://rangelands.org/
    Abstract
    The circum-Mediterranean perennial Ferula communis L.(giant fennel) has anticoagulant constituents. Mortality from poisoning can affect 5% of the sheep grazed in infested areas and most casualties are ewe-lambs at the onset of the grazing season. In intensive sheep production systems, ewe-lambs are “orphaned”, artificially reared, and have no opportunity to acquire safe dietary habits by imitating their mothers. The aim of the present study was to evaluate the intake of F. communis in such lambs and to assess the potential of using conditioned aversion as a managerial tool to decrease the frequency of F. communis poisoning. Six lambs weighing approximately 28 kg were averted to F. communis using 2 administrations of 4g LiClin aqueous solution, given immediately after a meal of F. communis; 6 similar lambs served as unaverted controls. The intake of F. communis and the persistence of aversion were assessed over 7 observation days using a simulation of an infested field where freshly cut bunches of F. communis were tied to stakes at 10-m intervals in ryegrass (Lolium multiflorum Lam.) paddocks at the late vegetative stage. Averted lambs grazed separately from unaverted counterparts. Time spent by lambs foraging on F. communis was in the range of 0–0.015 min/hour (not significantly different from nil) in averted, and 0.15–0.24 min/hour inunaverted lambs, respectively (P = 0.002). Consequently, the rate of disappearance of F. communis was greater when grazing was by unaverted than averted lambs (0.29 and 0.15 g/min, P =0.01). The aversion persisted for 25 days after the LiCl treatment, at which time observations were discontinued. Assuming that the amount of F. communis that disappeared is close to actual intake by lambs, intake by unaverted lambs was high enough to endanger the lambs, whereas averted lambs consumed safe amounts of the poisonous plant. It is concluded that conditioned aversion has the potential to alleviate the problem of F. communis poisoning in orphaned ewe-lambs.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003769
    Scopus Count
    Collections
    Journal of Range Management, Volume 52, Number 5 (September 1999)

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