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

Areskog, Marlene; Ljungström, Bitte; Höglund, Johan

doi:10.1016/j.ijpddr.2013.06.002

Cited by 18 publications

(14 citation statements)

References 42 publications

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“…Very few individual ORG animals had total FEC >500 epg, which would be considered a heavy infection (Corwin, 1997), and the observed total FEC in conventional herds were similar to those described in mature cows of dairy herds in Sweden and the UK (Höglund et al, 2001;Fox et al, 2007;Maggs et al, 2008). In contrast, FEC on ORG dairies were lower than the previously described nematode FEC in conventional cow-calf herds in the upper Midwest (Hildreth et al, 2007) or from a recent study in Sweden (Areskog et al, 2013).…”

Section: Discussionsupporting

confidence: 69%

Parasites and parasite management practices of organic and conventional dairy herds in Minnesota

Sorge

Moon

Stromberg

et al. 2015

Journal of Dairy Science

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The objective of this study was to describe the prevalence and practices used to manage internal helminth parasites and external arthropod parasites on organic and conventional dairy herds in Minnesota. All organic (ORG) dairy herds in Minnesota (n=114) and a convenience sample of conventional herds were invited to participate in the study. Thirty-five ORG herds and 28 conventional herds were visited once in summer and fall of 2012. Conventional dairy herds were split into small conventional (SC,<200 cows) and medium-sized conventional herds (MC, ≥200 cows) so that SC herds were comparable in size to the ORG herds. Dairy managers were surveyed to assess their farm management practices and perceptions about parasites, hygiene scores were recorded for adult stock, and fecal samples were collected from a nominal 20 breeding-age heifers to characterize abundance of internal parasites. Nonparametric tests were used to compare fecal egg counts per gram (FEC) among farms grouped by management systems and practices. Organic farms had more designated pasture and were more likely to use rotational grazing compared with conventional farms, but the stocking densities of animals on pasture were similar among farm types. The overall FEC were very low, and only a few individual ORG heifers had FEC >500 eggs/gram. Samples from heifers on ORG farms had significantly more strongyle-type eggs than those on SC and MC farms (ORG: 6.6±2.1; SC: 0.5±0.3; MC: 0.8±0.7), but egg counts of other types of gastrointestinal parasites did not differ significantly among the 3 herd groups. Fly control measures were applied mainly to milking cows and preweaned calves and were used on 88.6% of ORG herds, 60.0% of SC herds, and 91.7% of MC herds. Approximately half of the producers reported having seen skin conditions suggestive of lice or tail mange in their cattle during the previous winter (ORG: 48.6%, SC: 57.1%, MC: 53.9%). Although most conventional producers reported treating these skin conditions, most organic producers stated they had not treated them. In conclusion, gastrointestinal parasite egg counts were low overall at the time of the survey, and most surveyed producers did not perceive gastrointestinal parasites to be a problem for their animals' health. Independent of the herd type, fly control was mostly targeted at the lactating herd and preweaned calves.

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Section: Discussionsupporting

confidence: 69%

Parasites and parasite management practices of organic and conventional dairy herds in Minnesota

Sorge

Moon

Stromberg

et al. 2015

Journal of Dairy Science

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“…Our results are consistent with those of a Swedish study that described a limited effect (88% efficacy as determined by a FECRT) after administration of topical macrocyclic lactones (ML) against GIN (Areskog and others 2013). …”

Section: Discussionsupporting

confidence: 91%

Reduced efficacy of ivermectin against Ostertagia in a Dutch cattle herd

Holzhauer

Hegeman

Doorn

2017

Vet Record Case Reports

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A pilot study on reduced ivermectin efficacy against Ostertagia ostertagi following the detection of a high number of strongyle-type eggs in a 1.5-year-old bull during the first part of the pasturing period in 2015 was conducted. This finding was remarkable because of the pasturing history, treatment history and time after turnout (June). The study involved one beef cattle herd and followed as far as possible the World Association for the Advancement of Veterinary Parasitology guidelines regarding the faecal egg count reduction test. We observed poor ivermectin efficacy (65%) compared with the expected efficacy of >95%. This also has consequences for practitioners, who should ensure the correct application of anthelmintics and perform repeated faecal examinations following the use of parasitical agents for persistent problems. Our finding also should have consequences for the pharmaceutical industry: the administration of registered anthelmintics via the most efficacious route is preferable.

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“…Whereas serum pepsinogen concentration has mainly been used retrospectively, to change parasite management in future cohorts, FEC in the middle of the grazing season can be used to assess the likelihood that parasitic gastroenteritis will occur later in the same year (Shaw and others 1998). This concept was tested in both dairy and beef herds by Areskog and others (2013), where farmers sent in faecal samples from FSG calves. An average FEC of 100 or more eggs per gram (epg) has been suggested as a threshold for treatment by the FECPAK FEC counting system, and was tested in Sweden.…”

Section: Recent Tt/tst Studies In Cattlementioning

confidence: 99%

Practices to optimise gastrointestinal nematode control on sheep, goat and cattle farms in Europe using targeted (selective) treatments

Morgan²,

et al. 2014

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Due to the development of anthelmintic resistance, there have been calls for more sustainable nematode control practices. Two important concepts were introduced to study and promote the sustainable use of anthelmintics: targeted treatments (TT), where the whole flock/herd is treated based on knowledge of the risk, or parameters that quantify the severity of infection; and targeted selective treatments (TST), where only individual animals within the grazing group are treated. The aim of the TT and TST approaches is to effectively control nematode-induced production impacts while preserving anthelmintic efficacy by maintaining a pool of untreated parasites in refugia. Here, we provide an overview of recent studies that assess the use of TT/TST against gastrointestinal nematodes in ruminants and investigate the economic consequences, feasibility and knowledge gaps associated with TST. We conclude that TT/TST approaches are ready to be used and provide practical benefits today. However, a major shift in mentality will be required to make these approaches common practice in parasite control.

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

Cited by 18 publications

References 42 publications

Parasites and parasite management practices of organic and conventional dairy herds in Minnesota

Parasites and parasite management practices of organic and conventional dairy herds in Minnesota

Reduced efficacy of ivermectin against Ostertagia in a Dutch cattle herd

Practices to optimise gastrointestinal nematode control on sheep, goat and cattle farms in Europe using targeted (selective) treatments

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