Clinical nematodiriasis in calves due to Nematodirus battus infection

Armour, J.; Bairden, K.; Dalgleish, R; Ibarra-Silva, AM; Salman, S.K.

doi:10.1136/vr.123.9.230

Cited by 16 publications

(7 citation statements)

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“…The study of mixed or alternate grazing with sows and heifers resulted in a reduction of Ostertagia burden in heifers [58]. Such good results are not always obtained: it has been reported that mixed /alternate grazing may in some conditions favour sheep infection with Nematodirus battus in the field [15] or induce incidents of severe diarrhoea in calves [3]. No strategy is available for meat calves in organic farming.…”

Section: Discussionmentioning

confidence: 99%

Managing helminths of ruminants in organic farming

Cabaret¹,

Bouilhol

Mage

2002

Vet. Res.

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-The use of anthelmintics is strongly limited in organic farming. This may induce a change in the intensity (no of worms) and diversity (proportions of species) of helminth infection. Helminths remain a major preoccupation in organic sheep farming: high levels of infection have been recorded on several farms and helminth diversity is always higher. The helminth infection in milk cattle of northern Europe is controlled and diversity is higher in organic farms, as recorded in sheep. The role of helminth diversity on intensity is still unclear. Grazing management is one of the means to controlling helminths. The use of safe pastures for calves and sheep after weaning is one of the major components of control. The use of alternate or mixed grazing is common for cattle in northern countries but is uncommon for sheep in France. Grazing management is not sufficient to controlling infection in sheep and conventional anthelmintic treatments are performed. Additionally, alternative treatments are used. The alternative therapies based on phytotherapy or homeopathy are largely recommended in organic farming but do not have any demonstrated efficacy. More research is needed to evaluate such therapies. ruminant organic farm / helminth / grazing management / anthelmintic / phytotherapyRésumé -Gestion des helminthes de ruminants en agriculture biologique. L'emploi des anthelminthiques est fortement limité en élevage biologique. Cette diminution de leur utilisation peut conduire à des changements en ce qui concerne l'intensité (nombre de vers) et la diversité (proportion des espèces) des parasites. Les helminthes sont une préoccupation majeure en élevage biologique ovin : les infestations sont très fortes dans certaines fermes et la diversité est plus élevée que dans les élevages conventionnels. L'infestation des bovins laitiers par les helminthes dans les pays du nord de l'Europe est assez bien contrôlée et la diversité est plus forte également en élevage biologique. Le rôle de la diversité sur l'intensité n'est pas encore clair. La gestion des pâturages est l'un des moyens de contrôler l'infestation. L'utilisation de pâtures saines pour les veaux ou les agneaux après le sevrage est l'une des composantes essentielles de la gestion des parasites. L'utilisation de pâturage alterné ou mixte avec des espèces différentes est commun dans les régions nordiques pour les bovins mais n'est 625

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Section: Discussionmentioning

confidence: 99%

Managing helminths of ruminants in organic farming

Cabaret¹,

Bouilhol

Mage

2002

Vet. Res.

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“…Certain physiological traits important in transmission dynamics, i.e. hatching, arrested larval development, infectivity in alternate hosts particularly calves (Herbert & Probert, 1987;Armour et al 1988;Coop et al 1988), combine to form a life-history with a degree of plasticity. In terms of a possible change in the parasite's epidemiology, the question of phenotypic plasticity versus genotypic change is important, that is: whether the variations in life-history traits observed in North Wales could be selected for.…”

Section: Discussionmentioning

confidence: 99%

The epidemiology of Nematodirus battus – is it changing?

Thomas

1991

Parasitology

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Natural populations of 3rd-stage Nematodirus battus larvae were present on pastures in North Wales throughout the year; highest numbers were present in late spring, with smaller peaks occurring in autumn. Inter-site variation was observed in the timing and magnitude of these peaks. Hatching on experimental plots occurred 2 months to 2 years following deposition of eggs. Intraspecfic and inter-site variation occurred in the timing, and inter-site variation occurred in the magnitude, of the mass hatch on upland and lowland experimental plots. Arrested 4th-stage N. battus were recovered from Welsh Mountain lambs. Percentage arrest and number of arrested worms was greatest during winter and early spring. The prevalence and intensity of N. battus infection in 1-, 2- and 3-year-old Welsh Mountain ewes was low. The plasticity exhibited in the parasite's life-history is discussed in relation to potential changes in the epidemiology of nematodiriasis.

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“…Gastrointestinal nematode (GIN) species tend to have a preferred host, but there is considerable evidence to indicate transmission and adaptation between livestock species (sheep/goat/cattle) and between livestock and wildlife when either co-grazed or grazed alternately on the same pasture [15]. In farming systems, control by means of alternate grazing with different host species has been reported to break down due to parasite adaptation [16]. Older studies often lack genotyping and apparent infection across multiple host species may therefore constitute different parasite subpopulations or even species with cryptic host preferences, as with lungworms in deer [17].…”

Section: Parasite Adaptation To New Hostsmentioning

confidence: 99%

“…How can environmental impacts of anthelmintics be properly measured, including on non-target fauna, and ecosystem functioning and service provision? 16. What are the costs (financial, human and to animal welfare) of anthelmintic resistance?…”

Section: Section Ii: Economic and Environmental Impactsmentioning

confidence: 99%

100 Questions in Livestock Helminthology Research

Morgan

Aziz

Blanchard³

et al. 2019

Trends in Parasitology

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An elicitation exercise was conducted to collect and identify pressing questions concerning the study of helminths in livestock, to help guide research priorities. Questions were invited from the research community in an inclusive way. Of 385 questions submitted, 100 were chosen by online vote, with priority given to open questions in important areas that are specific enough to permit investigation within a focused project or programme of research. The final list of questions was divided into ten themes. We present the questions and set them briefly in the context of the current state of knowledge. Although subjective, results provide a snapshot of current concerns and perceived priorities in the field of livestock helminthology, and we hope will stimulate ongoing or new research efforts.

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Clinical nematodiriasis in calves due to Nematodirus battus infection

Cited by 16 publications

References 0 publications

Managing helminths of ruminants in organic farming

Managing helminths of ruminants in organic farming

The epidemiology of Nematodirus battus – is it changing?

100 Questions in Livestock Helminthology Research

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