Targeted application of anthelmintics to control trichostrongylosis in dairy goats: result from a 2-year survey in farms

Hoste, Hervé; Chartier, Christophe; Lefrileux, Yves; Goudeau, C.; Broqua, C.; Pors, I.; Bergeaud, Jean-Paul; Dorchies, P.

doi:10.1016/s0304-4017(02)00307-2

Cited by 23 publications

(9 citation statements)

References 19 publications

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“…at signs of disease, this is defined as a targeted selective treatment (TST) [23]. TST is an effective control measure to prevent AR, and despite the selective treatment, productivity in the untreated animals can be maintained [24, 49]. In the present study a total of 37% of the herds used TST: 50% of the hobby herds and 18% of the professional herds.…”

Section: Discussionmentioning

confidence: 99%

Gastrointestinal nematodes and anthelmintic resistance in Danish goat herds

et al. 2014

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The prevalence of gastrointestinal parasites in Danish goats and the presence of anthelmintic resistance (AR) in 10 selected herds were investigated during April–September 2012. All Danish herds (n = 137) with 10 or more adult goats were invited to participate, and of these 27 herds met the inclusion criterion of more than 10 young kids never treated with anthelmintics. Questionnaire data on management were collected, and faecal samples from 252 kids were analysed by the McMaster technique. From all herds with a mean faecal egg count (FEC) above 300 eggs per g of faeces, pooled samples were stained with peanut agglutinin (PNA) for specific detection of Haemonchus contortus. Strongyle eggs were detected with an individual prevalence of 69%, including Nematodirus battus (3.6%) and other Nematodirus species (15.0%). Eimeria spp. were observed in 99.6% of the kids. H. contortus was found in 11 of 12 (92%) tested herds. Anthelmintics were used in 89% of the herds with mean treatment frequencies of 0.96 and 0.89 treatments per year for kids and adults, respectively. In 2011, new animals were introduced into 44% of the herds of which 25% practised quarantine anthelmintic treatments. In 10 herds the presence of AR was analysed by egg hatch assay and FEC reduction tests using ivermectin (0.3 mg/kg) or fenbendazole (10.0 mg/kg). AR against both fenbendazole and ivermectin was detected in seven herds; AR against fenbendazole in one herd, and AR against ivermectin in another herd. In conclusion, resistance to the most commonly used anthelmintics is widespread in larger goat herds throughout Denmark.

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Section: Discussionmentioning

confidence: 99%

Gastrointestinal nematodes and anthelmintic resistance in Danish goat herds

et al. 2014

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“…This similar efficiency associated with a reduced number of treated animals per flock was not compensated by any increase in the number of annual drenches since the mean annual number of treatments fell from 3.5 to 2.1. Lastly, the recorded annual milk production obtained from 10 farms did not show any major drop from year 1 to year 2 [34].…”

Section: Surveys Of Dairy Goat Farms In Different Areas Of Productionmentioning

confidence: 98%

Control of gastrointestinal parasitism with nematodes in dairy goats by treating the host category at risk

Hoste¹,

Chartier

Frileux

2002

Vet. Res.

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-Infections of the gastrointestinal tract with parasitic nematodes remain one of the main limiting factors in grazing dairy goats. The usual mode of control of these parasitic diseases has up to now been based on the repeated use of anthelmintics. However, the prevalence rates of anthelmintic resistances, in particular to benzimidazoles, are now particularly high in the French dairy goat production. This situation makes it mandatory to reconsider the usual mode of control of these nematodes and to look for short term, alternative solutions which combine the control of gastrointestinal infections and management of anthelmintic resistances. One of the possible options is to leave a part of the flock without treatment during the grazing season in order to maintain alleles of susceptibility to anthelmintics within the worm populations. Previous epidemiological observations identifying the categories of host populations at risk are presented which provide the rationale for targeted applications of treatments. The results of assays on experimental flocks and from farm surveys examining the advantages and drawbacks of selective treatments are presented. The value of these results in combination with other alternative solutions of control are discussed in order to use minimum treatments with maximum benefits. dairy goat / anthelmintic / selective treatment / anthelmintic resistance / parasitic nematode Résumé -Maîtrise des strongyloses gastro intestinales chez les chèvres laitières par l'application de traitements ciblés. Les infestations par les nématodes du tractus gastro intestinal demeurent un des principaux facteurs limitant à l'élevage des chèvres laitières au pâturage. Le mode usuel de maîtrise de ce parasitisme reposait jusqu'à présent sur un usage répété de molécules anthelminthiques. Cependant, la prévalence des lignées résistantes aux anthelminthiques, en particulier aux benzimidazoles, en éle-vage caprin laitier en France, est désormais très élevée. Ce constat oblige à rechercher rapidement des 531

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“…Milk production Epidemiological studies in dairy goat flocks in France have shown that animals in their first lactation and high milk producing multiparous animals have higher faecal egg counts (Hoste et al, 2002a). Targeting anthelmintic treatments towards these two groups in a 2-year study reduced anthelmintic treatments by 48% and 66% in years 1 and 2 respectively, with no negative effects on milk production or worm egg excretion (Hoste et al, 2002b). …”

Section: Performance Based Indicatorsmentioning

confidence: 99%