Worm burden and immunological responses in Corriedale and Crioula Lanada sheep following natural infection with Haemonchus contortus

Bricarello, Patrízia Ana; Gennari, Solange Maria; Oliveira-Sequeira, T.C.G.; Vaz, C. M. S. L.; Gonçalves, Isabel Gonçalves de; Echevarria, F. A. M.

doi:10.1016/s0921-4488(03)00188-3

Cited by 60 publications

(39 citation statements)

References 30 publications

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“…On the contrary, Martínez-Valladares et al (2013) observed comparatively lower EPG values than those of our findings. This discrepancy may be due to differences in sample size (Gasbarre et al, 1996), infective larvae inhibition or suppression of egg production (Bricarello et al, 2004) and exposure of fecal material to the environment (Das et al, 2011). Further, EPG values can be altered due to seasonal influence, being higher in summer than in winter (Ahmed, 2010).…”

Section: Discussionmentioning

confidence: 99%

Correlation of Trace Mineral Profiles with Gastrointestinal Worm Burden in Rangeland Sheep of Chakwal District, Punjab, Pakistan

Qudoos¹,

Khan²,

Sajid³

et al. 2017

IJAB

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To cite this paper: Qudoos, A., M.N. Khan, M.S. Sajid and G. Muhammad, 2017 Pearson correlation demonstrated a non-significant (p>0.05) correlation of trace and ultra-trace minerals with EPG magnitude in naturally parasitized sheep of the study area. In conclusion, trace and ultra-trace mineral levels in naturally infected sheep flocks exhibited no significant role in reducing GI parasitic burden.

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Section: Discussionmentioning

confidence: 99%

Correlation of Trace Mineral Profiles with Gastrointestinal Worm Burden in Rangeland Sheep of Chakwal District, Punjab, Pakistan

Qudoos¹,

Khan²,

Sajid³

et al. 2017

IJAB

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“…Animais com carga parasitária elevada apresentam valores reduzidos de VG e PPT devido a espoliação produzida pelos parasitos (AMARANTE et al, 2004;BRICARELLO et al, 2004). Portanto, as diferenças observadas entre os grupos decorreram dos efeitos deletérios do parasitismo.…”

Section: Discussionunclassified

ContaminaÇão da pastagem com larvas infectantes de nematoides gastrintestinais após o pastejo de ovelhas resistentes ou susceptíveis à verminose

Bassetto

Silva

Fernandes

et al. 2009

RBPV

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ResumoO grau de contaminação da pastagem por larvas de terceiro estágio (L3) de nematoides gastrintestinais foi avaliado em piquetes pastejados por ovelhas resistentes ou susceptíveis à verminose. O experimento foi realizado de 23 de novembro de 2007 a 22 de julho de 2008. Inicialmente, realizou-se a contagem de ovos por grama de fezes (OPG) de amostras individuais de 130 ovelhas adultas da raça Bergamácia. Dessas, foram selecionadas as nove ovelhas com contagens mais elevadas de OPG (susceptíveis) e as 10 com as menores contagens (resistentes). As ovelhas resistentes apresentaram menor contagem de OPG, maiores valores de volume globular, de proteína plasmática total e de eosinófilos sanguíneos, do que as ovelhas susceptíveis. O peso também foi maior no grupo resistente. Na pastagem, foram identificadas larvas de Haemonchus spp., Trichostrongylus spp. e Oesophagostomum spp. Em média, as quantidades de L3 de Haemonchus spp. e de Trichostrongylus spp., na pastagem, foram 2,19 e 2,31 vezes, respectivamente, maiores nos piquetes pastejados pelo grupo susceptível do que nos do grupo resistente. Portanto, os animais susceptíveis devem ser eliminados do rebanho a fim de reduzir a contaminação da pastagem e otimizar a profilaxia das infecções por nematoides gastrintestinais.Palavras-chave: Haemonchus, Trichostrongylus, pastagem, ovinos, profilaxia. AbstractThe degree of contamination of herbage with third stage larvae of gastrointestinal nematodes was evaluated in paddocks grazed by resistant or susceptible ewes. The trial occurred from November 23, 2007 to July 22, 2008. Initially, fecal egg counts (FEC) were performed with individual samples of 130 adult ewes of the Bergamacia breed. Of those animals, nine ewes with the highest FEC (susceptible group) and 10 with the lowest counts (resistant group) were selected and moved to separate paddocks. The resistant ewes presented lower FEC, higher values of packed cell volume, total plasma protein and blood eosinophils than the susceptible ewes. The weight was also higher in the resistant group. Haemonchus spp., Trichostrongylus spp. and Oesophagostomum spp. third stage larvae were recovered from pasture. In average, the amount of Haemonchus spp. and Trichostrongylus spp. third stage larvae in the pasture were 2.19 and 2.31 times, respectively, higher in the paddocks grazed by susceptible group in comparison with those grazed by the resistant animals. Therefore, the susceptible animals should be eliminated from the flock in order to reduce pasture contamination and optimize the prophylaxis of gastrointestinal nematode infections.

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“…Th2 responses involve the influx of inflammatory cells into the local mucosa and generation of immunoglobulin (Ig) E antibody (Harrison et al 1999;Huntley et al 2001). Locally, there is an increase in the number of mast cells, eosinophils, specific antibodies, mucus production and inhibitory substances (Huntley et al 1992;Pfeffer et al 1996;Harrison et al 1999;Bricarello et al 2004). Initially, Th2 cytokines, including a number of interleukins (IL) (IL-4, IL-5, IL-9, IL-10 and IL-13), appear in the mesenteric lymph nodes and Peyer's patches and then go to spleen following the systemic circulation.…”

Section: Types Of Immune Response Against Ginsmentioning

confidence: 99%

Small ruminant resistance against gastrointestinal nematodes: a case of Haemonchus contortus

et al. 2011

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Gastrointestinal nematode (GIN) infections are a common constraint to small ruminant industry throughout the world, and among those, haemonchosis has its own significance. Control of GIN primarily relies on the use of anthelmintics, but this approach has become less reliable due to the development of resistance in GINs against commonly used anthelmintics and an increased consumer demand for environmentally friendly animal products. These issues have stimulated investigations to find alternative sustainable control strategies, which are less reliant on anthelmintic input. One of such strategies is breeding of small ruminants for their resistance to the GINs. The susceptibility and resistance of animals to GIN infections varies within and between breeds. Various parasitological, biochemical and immunological parameters are employed to evaluate natural resistance status of animals both in natural pasture and artificial infections. The immune mechanisms responsible for resistance are not completely understood, but it has a significant effect in inherited resistance. Relatively resistant or tolerant animals show better local and generalised immune response as compared to susceptible. Immune response against GINs is influenced by many physiological factors. Determination of specific genes linked with host resistance will provide a valuable approach to find out the molecular mechanism of host resistance to GINs. Resistance has been reported to reduce pasture contamination, which in turn reduces re-infection and thus the requirement of the frequent anthelmintic treatments. The efficiency of control can be increased through objective and accurate identification of genetically tolerant individuals by natural and artificial infections with GINs. Complete resistance is the ultimate solution, but this has generally been ignored as a commercial reality. This paper reviews the published reports on natural resistance in small ruminants and discusses the prospects of developing small ruminants, which could be resistant to GINs.

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Worm burden and immunological responses in Corriedale and Crioula Lanada sheep following natural infection with Haemonchus contortus

Cited by 60 publications

References 30 publications

Correlation of Trace Mineral Profiles with Gastrointestinal Worm Burden in Rangeland Sheep of Chakwal District, Punjab, Pakistan

Correlation of Trace Mineral Profiles with Gastrointestinal Worm Burden in Rangeland Sheep of Chakwal District, Punjab, Pakistan

ContaminaÇão da pastagem com larvas infectantes de nematoides gastrintestinais após o pastejo de ovelhas resistentes ou susceptíveis à verminose

Small ruminant resistance against gastrointestinal nematodes: a case of Haemonchus contortus

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