Comparative efficacy, persistent effect, and treatment intervals of anthelmintic pastes in naturally infected horses

Mercier, P.; Chick, B. F.; Alves-Branco, Francisco; White, C. J.

doi:10.1016/s0304-4017(01)00453-8

Cited by 29 publications

(22 citation statements)

References 25 publications

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“…It should be noted that there is no fecal egg count limit for treatment, but the breeding must be monitored monthly through faecal examinations to elaborate an ideal control program. A large amount of data has suggested a limit of EPG for the treatment of the animals, and Mercier et al (2001) indicated that values of 100 to 300 EPG may be a reasonable goal. In accordance with the observations of some authors, in this study, symptoms generally only appeared in severe infections (EPG above 1000 in adult animals); however, there could be some amount of individual variation and animals without symptoms, but breed animals with high EPG values show damage in development and performance.…”

Section: Resultsmentioning

confidence: 99%

“…For the analysis, the parasitism intensity, age category of mares, physiological category, and frequency of worming were categorized. The parasitism intensity was categorized on the basis of the number of eggs per gram of faeces (EPG) of the animals, with an upper boundary value of 200 in accordance with Mercier et al (2001). With the results recorded in the parasitological examination, the prevalence of the helminths in the examined mares and stud farms was calculated, as well as the prevalence of the infective larvae of nematodes in the faecal cultures (Pereira 1995).…”

Section: Methodsmentioning

confidence: 99%

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Survey on control and management practices of equine helminthes infection

et al. 2009

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Pesq. Vet. Bras. 29(3):253-257, março 2009 RESUMO.-[Inquérito sobre práticas de manejo e controle das helmintoses em éguas no Brasil.] Vinte nove haras foram selecionados na região do Médio Paraíba, Estado do Rio de Janeiro, os responsáveis pelos animais entrevistados e amostras fecais de éguas foram coletadas e submetidas às técnicas de OPG, Coprocultura, Sedimentocentrifugo-flutuação, Ueno e Baermann modificadas. A prevalência dos helmintos para as éguas e haras foi calculada. A capacidade de suporte, a troca de cama nas baias, a ausência da rotação do pasto, a ausência do tecnificação na propriedade e menor freqüência do tratamento dos animais foram associadas à prevalência maior dos helmintos, indicando que estas variáveis devem ser consideradas em programas de controle dos helmintos de eqüinos. A intensidade do parasitismo foi também associado à capacidade de suporte do pasto, à ausência de esterqueira, à presença dos animais somente nos pastos, à ausência do tecnificação na propriedade, à menos freqüência do tratamento e à ausên-cia de uso da rotação da classe anti-helmintica. TERMOS DE INDEXAÇÃO: Praticas de manejo e controle, helmintos, tratamento, eqüinos. INTRODUCTIONInternal parasites are a significant threat to the health of horses. Horses are susceptible to more than 60 internal parasites and may harbor several species of worms at any time. (Stoltenow & Purdy 2003). Helminths are an important cause of morbidity and mortality in equines, and the prevalence of infection with these parasites is high enough to clinical parasitism (Proudman & Mattews 2000). In Brazil, in spite of the enormous population of horses, there are few studies on equine helminth control. Also, limited information is available concerning risk factors for worm infection. Twenty-nine stud farms were selected in the Medium Paraíba region of the Rio de Janeiro state, Brazil. After an interview with the person responsible for the animals, faecal samples were collected from mares and analyzed via the EPG technique, faecal cultures, Sedimentation-centrifugo-flotation, and modified Ueno and Baermann techniques. The prevalence of helminths in the mares and in the stud farms was calculated. The stocking rates of pasture, change of horse bedding, absence of pasture rotation, absence of technology in the property, and less frequent treatment of the animals were associated with a greater prevalence of helminths, showing that these variables must be considered in equine control programs. The intensity of the parasitism was also associated with the stocking rate of pasture, absence of dunghill, presence of the animals only in paddocks, lack of technology in the property, less frequent treatment of the animals, and absence of the use of rotation regarding the anthelmintic class.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Survey on control and management practices of equine helminthes infection

et al. 2009

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“…ERPs in anthelmintic sensitive populations can vary but were previously generally specified as 6–8 weeks for BZs, 6 weeks for pyrantel, 8–10 weeks for IVM and >13 weeks for MOX (Herd and Gabel 1990; Borgsteede et al . 1993; Mercier et al . 2001).…”

Section: Anthelminticsmentioning

confidence: 99%

An update on cyathostomins: Anthelmintic resistance and diagnostic tools

Stratford

McGorum

Pickles

et al. 2011

Equine Veterinary Journal

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SummaryCyathostomins represent a potential cause of equine morbidity and have become the main focus of endoparasite control in managed horses. All grazing horses are at risk of infection with cyathostomins; therefore, the application of appropriate management measures is essential. Anthelmintics currently comprise the main method of control for equine nematodes and the ready availability of these products in some countries has resulted in their use becoming dissociated from veterinary involvement. This is concerning given the levels of anthelmintic resistance that have been recorded in cyathostomin populations. It is important that veterinarians re-establish control over the implementation of parasite control programmes, a major objective of which should be the preservation of anthelmintic efficacy. This article details the principles of cyathostomin control in horses with particular reference to anthelmintic resistance, and the use and interpretation of diagnostic tests for detecting cyathostomins and identifying anthelmintic resistance.

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“…Some investigators calculate the ERP as the first week in which eggs appear in the stool [25–28]. Other authors consider the EPG as 100 [16], 200 [29], <80% of the FECR [30] or <90% of the FECR [31–33]. In our study, ERP was considered to be the time a < 90% FECR was obtained.…”

Section: Discussionmentioning

confidence: 99%

Searching for ivermectin resistance in a Strongylidae population of horses stabled in Poland

et al. 2017

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BackgroundThere are no available studies describing the possible resistance of strongyles to ivermectin in horses in Poland. One hundred seventy three horses from nine stud farms from South-Western Poland were studied. The effectiveness of ivermectin was studied on the 14th day after ivermectin administration using the fecal egg count reduction test, and a long-term observation of the egg reappearance period was carried out. The fecal study was carried out using a modified McMaster method, which typically detects 20 eggs per gram of stool. The results were subjected to statistical analysis that enabled quantification of the eggs in the stool samples.ResultsThe study revealed high efficacy of ivermectin on the 14th day after administration without a shortening of the egg reappearance period.ConclusionThe results indicate that strongyles resistance to ivermectin in Poland is not a serious problem.

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Comparative efficacy, persistent effect, and treatment intervals of anthelmintic pastes in naturally infected horses

Cited by 29 publications

References 25 publications

Survey on control and management practices of equine helminthes infection

Survey on control and management practices of equine helminthes infection

An update on cyathostomins: Anthelmintic resistance and diagnostic tools

Searching for ivermectin resistance in a Strongylidae population of horses stabled in Poland

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