Variation in ptaquiloside content in bracken (Pteridium esculentum (Forst. f) Cockayne) in New Zealand.

Lars Holm Rasmussen, Denis Lauren, Barry L. Smith, Hans Christian Bruun Hansen

    Publikation: Bidrag til tidsskriftTidsskriftsartikelForskningpeer review

    Abstract

    AIM: To examine stands of bracken fern (Pteridium esculentum)
    from throughout New Zealand for the presence and concentration
    of ptaquiloside (Pta), and to compare the presence and/or
    concentrations of Pta in areas where bovine enzootic haematuria
    (BEH) and/or acute haemorrhagic syndrome (AHS) has been
    known to occur with those where BEH/AHS has not been recorded.
    METHODS: Stands of bracken fern were sampled from 275
    sites throughout New Zealand. Sixty-two stands were from a
    regional survey predominantly from the Waikato and Coromandel
    regions, 27 were from a farm in the King Country where
    BEH/AHS had been investigated previously, and 186 were from
    a national survey of the North and South Islands. Sampling
    sites were from a mixture of grazed paddocks, roadsides, and
    forest and bush areas. Samples comprised whole young fronds,
    the tops of unfurling young fronds, or, for the Regional Survey,
    mature green fronds from the previous season. Pta was extracted
    from the samples, and measured using high-performance liquid
    chromatography. Information on the occurrence of BEH/AHS
    at specifi c locations was obtained from published information
    and records from animal health laboratories in New Zealand.
    RESULTS: The 275 samples contained widely varying concentrations
    of Pta. In the Farm Survey, concentrations ranged
    from 280–13,300 (mean 3,800) μg/g (on a dry-weight basis)
    in the 63% of samples that contained Pta. A high proportion
    of samples from the Regional and National Surveys covering
    large areas of the country contained no detectable levels of Pta.
    The majority (61%) of samples from these two surveys which
    contained Pta were from areas where BEH/AHS was reported to
    occur. Combining data from all surveys, in areas with reported
    BEH/AHS, 42% of samples collected contained Pta, compared
    with 6% where BEH/AHS was not known to occur.
    CONCLUSIONS: Concentrations of Pta in bracken in New
    Zealand vary greatly, and in a high proportion of stands Pta
    is not found. A higher incidence of Pta, and some very high
    concentrations, are found in areas where BEH/AHS was known
    to occur.
    OriginalsprogEngelsk
    TidsskriftNew Zealand Veterinary Journal
    Vol/bind56
    Udgave nummer6
    Sider (fra-til)304-309
    ISSN0048-0169
    StatusUdgivet - 2008

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