Os parasitas de ovinos

Amarante, Alessandro Francisco Talamini do; Ragozo, Alessandra Mara Alves; Silva, Bruna Fernanda da

doi:10.7476/9788568334423

Cited by 37 publications

(58 citation statements)

References 162 publications

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“…Analyses were carried out applying the F81+I+G model and 1000 bootstrap replicates for all analyses. Survey of vector-borne and nematode parasites in sheep from Southern Brazil lead animals to severe anemic conditions (Amarante, 2014), and thus, may explain the anemic status of the animals studied herein. The remainder eight anemic sheep also presented high values of EPG, ranging from 800 to 5,200.…”

Section: Discussionmentioning

confidence: 90%

Survey of vector-borne and nematode parasites involved in the etiology of anemic syndrome in sheep from Southern Brazil

Mongruel

Spanhol

Valente

et al. 2020

Rev. Bras. Parasitol. Vet.

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Although anemia has been historically linked to Haemonchus contortus infection, other infectious agents, such as hemotropic mycoplasmas and tick-borne disease pathogens, may also lead to anemic crisis in sheep. This study has aimed to investigate infections related to anemia in a sheep herd from Bandeirantes City, Paraná State, southern Brazil. Seven out of forty-two (16.6%; 95% CI: 8.32–30.6%) sheep were positive for hemoplasmas by a PCR targeting the 16S rRNA gene and all tested negative for A. marginale/A. ovis and Babesia/Theileria spp. by PCR based on msp4 and 18S rRNA genes, respectively. Two (4.7%; 95% CI: 1.32–15.79%) animals were infested with Rhipicephalus microplus ticks. Fecal egg counting was performed in 38 sheep and 24 (63.15%; 95% CI: 47.2–76.6%) presented > 500 eggs per gram. Phylogenetic analysis of partial sequences of the detected hemotropic Mycoplasma sp. 16S and 23S rRNA genes confirmed that the animals were infected with Mycoplasma ovis. Polymorphism analysis of partial 16S rRNA sequences showed three different genotypes of M. ovis infecting sheep assessed in the present study. Mycoplasma ovis and gastrointestinal nematodes occurs in sheep from the northern region of Paraná State.

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Section: Discussionmentioning

confidence: 90%

Survey of vector-borne and nematode parasites involved in the etiology of anemic syndrome in sheep from Southern Brazil

Mongruel

Spanhol

Valente

et al. 2020

Rev. Bras. Parasitol. Vet.

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“…In the larval migration inhibition test (LMI), the 9.4 mg/mL concentration obtained 63.7% efficacy; a similar study carried out by Yoshihara et al (2014), who tested condensed tannins extracted from Acacia mearnsii, found that the 12.5 mg/mL concentration showed 56.3% inhibition, and only reaching 97.1% at the highest concentration used -100 mg/mL, thus demonstrating that better results can be obtained with a concentration increase. When analyzing the results of A. graveolens essential oil action in the different H. contortus development phases, L3 was found to be the most resistant, which can be attributed to the presence of the double cuticle at this larval stage as well as to the lower metabolic activity that occurs at this stage, a fact which was also mentioned by Amarante et al (2014).…”

Section: Discussionmentioning

confidence: 78%

Antihelminthic action of the Anethum graveolens essential oil on Haemonchus contortus eggs and larvae

et al. 2021

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Gastrointestinal nematodes are responsible for great economic losses in sheep raising, and their control has long been carried out almost exclusively by the administration of anthelmintics, which have led to serious resistance problems. In the search for alternative control measures, phytotherapic research is highlighted. The aim of this study was to evaluate the action of Anethum graveolens (dill) essential oil on different stages of Haemonchus contortus life cycle, as well its cytotoxicity MDBK (Madin-Darby bovine kidney) cells. H. contortus larvae and eggs were obtained from infected sheep feces, and essential oil extracted from plant seeds through the Clevenger apparatus. 9.4, 4.7, 2.35, 1.17. 0.58 and 0.29 mg/mL concentrations were evaluated. The Egg Hatch Inhibition (HI), Larval Development Inhibition (LDI) and Larval Migration Inhibition (LMI) techniques were used. Thybendazole 0.025 mg/mL in HI and Levamisole 0.02 mg/mL in the LDI and LMI tests were used as positive controls, while distilled water and a Tween 80 solution were used as positive negative controls. The inhibition results obtained for the highest oil concentration were: HI 100%, LDI 98.58% and LMI 63.7%, differing ( <0.05) from negative controls. Main A. graveolens oil components present in 95.93% of the total oil were Dihydrocarvone (39.1%), Carvone (22.24%), D-Limonene (16.84%), Apiol (10.49%) and Trans-dihydrocarvone (7.26%). Minimum A. graveolens essential oil concentrations required to inhibit 50% (IC50) of egg hatching, larval development and larval migration were 0.006 mg/mL, 2.536 mg/mL and 3.963 mg/mL, respectively. Cell viability in MDBK (Madin-Darby bovine kidney) cells, when incubated with A. graveolens essential oil, was 86% for the highest (9.4 mg/mL) and 99% for the lowest concentration (0.29 mg/mL). A. graveolens essential oil, according to the results obtained in this study, is a promising alternative in sheep gastrointestinal nematode control. ResumoOs nematoides gastrintestinais são responsáveis por grandes perdas econômicas na ovinocultura, e seu controle tem sido realizado quase exclusivamente pela administração de anti-helmínticos, que levaram a sérios problemas de resistência. Na busca de medidas alternativas de controle, destaca-se a pesquisa fitoterápica. O objetivo deste trabalho foi avaliar a ação do óleo essencial de Anethum graveolens (endro) em diferentes estágios de Haemonchus contortus, bem como testar a viabilidade celular para o óleo. Larvas e ovos de H. contortus foram obtidos de fezes de ovinos infectados e óleo essencial extraído de sementes de plantas através do aparelho de Clevenger. As concentrações avaliadas foram 9,4, 4,7, 2,35, 1,17, 0,58 e 0,29 mg/mL. Verificou-se a Inibição de eclosão dos ovos (IE), Inibição de Desenvolvimento Larval (IDL) e Inibição de Migração Larval (IML). Tiabendazol 0,025 mg/mL em IE e Levamisole 0.02 mg/mL nos testes IDL e IML foram usados como controles positivos, enquanto água destilada e uma solução Tween 80 foram usados como controles negativos. Os resultados de inibição o...

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“…After all these merozoites develop into microgametocyte or microgametocyte, and the microgamete will fertilize the macrogamete, creating a new oocyst non sporulated inside the intestinal cell. Occurring a cell rupture, the oocyst is released in the environment to infect a new host (AMARANTE et al, 2014).…”

Section: Eimeria Sppmentioning

confidence: 99%

Coproparasitogical evaluation of sheep treated with ivermectin and abamectin association in mineiros, Goiás

Silva¹,

Duarte²,

Pereira³

et al. 2020

BJD

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Brazilian sheep farming is an agricultural activity that although it is in a growing expansion still does not have high production of lamb homogeneously from its flock. The sanity is currently in the country one of the factors that hinder the efficiency in sheep production. Animal health should be a priority, as it acts as the foundation for successful breeding. Gastrointestinal endoparasites make each day a more complex obstacle for small ruminant professionals and producers, as such parasites are easy to spread, widely distributed, and sometimes mistakenly controlled. The negative relation in the zootechnical indices of herds that present high infestation of these microorganisms is remarkable. The present work sought through quantitative research, to evaluate the parasitic profile of the sheep herd of an experimental farm in Mineiros, Goiás, in order to provide possible control measures for this problem. However, the results obtained may add to the knowledge of other producers in the region, in order to mitigate factors linked to low productivity due to high endoparasite infestations, so that sheep farming becomes more efficient, not only in the municipality of Mineiros, but all over Brazil

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Os parasitas de ovinos

Abstract: Todo o conteúdo deste trabalho, exceto quando houver ressalva, é publicado sob a licença Creative Commons Atribição 4.0.Todo el contenido de esta obra, excepto donde se indique lo contrario, está bajo licencia de la licencia Creative Commons Reconocimento 4.0.

Cited by 37 publications

References 162 publications

Survey of vector-borne and nematode parasites involved in the etiology of anemic syndrome in sheep from Southern Brazil

Survey of vector-borne and nematode parasites involved in the etiology of anemic syndrome in sheep from Southern Brazil

Antihelminthic action of the Anethum graveolens essential oil on Haemonchus contortus eggs and larvae

Coproparasitogical evaluation of sheep treated with ivermectin and abamectin association in mineiros, Goiás

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