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  • Are multiple pre-treatment groups necessary or unwarranted in faecal egg count reduction tests in sheep?

    Author(s) : McKenna, P. B.

    Author Affiliation : Gribbles Veterinary, P.O. Box 536, Palmerston North, New Zealand.

    Author Email : phil.mckenna@gribbles.co.nz

    Journal article : Veterinary Parasitology 2013 Vol.196 No.3/4 pp.433-437 ref.14

    Abstract : Previously conducted faecal egg countfaecal egg countSubject Category: Techniques, Methodologies and Equipment
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    faecal egg countSubject Category: Techniques, Methodologies and Equipment
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    reduction tests (FECRTs) in sheepsheepSubject Category: Organism Names
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    involving a number of different anthelmintic treatments, were used to examine the effects of comparing post-treatment faecal egg counts (FECs) with pre-treatment counts from either the same treatment groups (matched FECRs) or with those from other treatment groups (unmatched FECRs). Each of these unmatched FECRs were considered to be analogous to those that might otherwise have been obtained by the use of a randomly selected group of animalsanimalsSubject Category: Organism Names
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    to provide a single pre-treatment baseline for comparing all post-treatment results. An examination of these comparisonscomparisonsSubject Category: Miscellaneous
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    showed that the use of either procedure was likely to result in similar estimates of anthelmintic efficacyefficacySubject Category: Properties
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    and the detection of a comparable number of cases of anthelmintic-resistance. Only on 1.1% of occasions did the FECRs from any of the unmatched groups fall outside the 95% confidence limits of the FECRs of their corresponding matched counterparts and in just 9.8% (54/553) of instances were there any disagreements between the number of cases categorised as either resistant or susceptible on the basis of a < or ≥95% FECR. These findings suggest that any improvements in accuracy and reliability that might supposedly be achieved by the use of multiple pre- and post-treatment FECs from the same treatment groups as opposed to those likely to be provided by the use of a single randomly selected representative pre-treatment group, may be largely illusory.

    ISSN : 0304-4017

    DOI : 10.1016/j.vetpar.2013.03.021

    Record Number : 20133329001

    Publisher : Elsevier Ltd

    Location of publication : Oxford

    Country of publication : UK

    Language of text : English

    Indexing terms for this abstract:

    Organism descriptor(s) : animalsanimalsSubject Category: Organism Names
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    , NematodanematodaSubject Category: Organism Names
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    , sheepsheepSubject Category: Organism Names
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    Descriptor(s) : anthelmintic propertiesanthelmintic propertiesSubject Category: Properties
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    , anthelminticsanthelminticsSubject Category: Chemicals and Chemical Groups
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    , comparisonscomparisonsSubject Category: Miscellaneous
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    , drug resistancedrug resistanceSubject Category: Properties
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    , efficacyefficacySubject Category: Properties
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    , faecesfaecesSubject Category: Miscellaneous
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    , helminthoseshelminthosesSubject Category: Diseases, Disorders, and Symptoms
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    , helminthshelminthsSubject Category: Organism Groups
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    , infectionsinfectionsSubject Category: Diseases, Disorders, and Symptoms
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    , parasitesparasitesSubject Category: Organism Groups
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    , parasitologyparasitologySubject Category: Disciplines, Occupations and Industries
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    , parasitosesparasitosesSubject Category: Diseases, Disorders, and Symptoms
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    , helminth ovahelminth ovaSubject Category: Anatomical and Morphological Structures
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    , faecal egg countfaecal egg countSubject Category: Techniques, Methodologies and Equipment
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    Identifier(s) : faecal egg counts, fecesfecesSubject Category: Miscellaneous
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    , nematodes, parasitic diseases, parasitic infestations, parasitic worms, parasitosis

    Broader term(s) : eukaryoteseukaryotesSubject Category: Organism Names
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    , invertebratesinvertebratesSubject Category: Organism Names
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    , animalsanimalsSubject Category: Organism Names
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    , OvisovisSubject Category: Organism Names
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    , BovidaebovidaeSubject Category: Organism Names
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    , ruminantsruminantsSubject Category: Organism Names
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    , ArtiodactylaartiodactylaSubject Category: Organism Names
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    , mammalsmammalsSubject Category: Organism Names
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    , vertebratesvertebratesSubject Category: Organism Names
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    , ChordatachordataSubject Category: Organism Names
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