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Limited efficacy of pour-on anthelmintic treatment of cattle under Swedish field conditions

Areskog, Marlene and Ljungström, Bitte and Höglund, Johan (2013). Limited efficacy of pour-on anthelmintic treatment of cattle under Swedish field conditions. International Journal for Parasitology: Drugs and Drug Resistance. 3 , 129-134
[Research article]

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Official URL: http://dx.doi.org/10.1016/j.ijpddr.2013.06.002


A study on the effect of topical macrocyclic lactones (ML) against gastrointestinal nematodes (GIN) in Swedish first season grazing cattle (FSG) was performed during the grazing seasons of 2009 and 2010. Herds were recruited through farming press and both dairy and beef cattle farms were invited. A questionnaire revealed that 64% of participating farmers dewormed their animals in previous years, and of these 76% used topical formulations with ML. Four to six weeks after turnout, 107 (2009) and 64 (2010) farmers sent in individual faecal samples from 6-10 FSG. Faecal egg counts (FEC) were determined by the FECPAK®-method in 2009 and the McMaster-method in 2010, when also larvae were cultured. Average FEC of ≥100 eggs per gram faeces (EPG) was seen in 39% of the herds in 2009 and 42% in 2010 and with arithmetic means of 258 ±110 and 252 ±350 EPG, respectively. Interestingly, FSG in dairy and beef herds had similar mean FEC. In herds with mean FEC of ≥100 EPG, farmers dewormed all FSG in the tested grazing group with ivermectin (IVM) or doramectin (DOR) pour-on. In 2009, 33 (31%), and in 2010, 26 (40%) of the herds were retested 7-16 days post treatment. Mean reduction was 89% and 88%, respectively, and in only 12 (36%) and 10 (38%) herds it was ≥95%. Beef herds had mean reductions similar to those of the dairy herds. No significant difference (P=0.66) in reduction was seen between the groups treated with three different pour-on formulations, nor was there any correlation between the previous year's usage of anthelmintics and the efficacy. Larvae from post-treatment cultures analysed in 2010 with a species-specific ITS2 qPCR showed that Cooperia oncophora was the predominant species after deworming. Four (15%) groups also harboured surviving Ostertagia ostertagi post treatment.

Authors/Creators:Areskog, Marlene and Ljungström, Bitte and Höglund, Johan
Title:Limited efficacy of pour-on anthelmintic treatment of cattle under Swedish field conditions
Series Name/Journal:International Journal for Parasitology: Drugs and Drug Resistance
Year of publishing :2013
Page range:129-134
Number of Pages:6
Additional Information:Published with permission from Elsevier
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:L Animal production > L50 Animal physiology and biochemistry
L Animal production > L73 Animal diseases
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Pathobiology
Agrovoc terms:Parasites, Gastrointestinal system, Ivermectin, Resistance to anthelmintics
Keywords:Gastrointestinal parasites, Doramectin, Ivermectin, Anthelmintic resistance
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Type of IDID
Alternative URL:http://www.sciencedirect.com/science/article/pii/S2211320713000122#
ID Code:11107
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Biomedical Sciences and Veterinary Public Health
Deposited By: SLUpub Connector
Deposited On:04 Apr 2014 14:45
Metadata Last Modified:19 Apr 2015 01:36

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