Infect Genet Evol. Jan; doi: / Epub Nov 1. Unexpected occurrence of Haemonchus placei in cattle in southern . ABSTRACT. Molecular and morphological methods were evaluated to distinguish between Haemonchus contortus and Haemonchus placei species. A total of. Haemonchus placei is a species of parasitic nematode that infects cattle. What is a nematode? Nematodes, also called roundworms, are worm-shaped animals.

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Results A total of H. Vet Parasitol ; Differences in the morphology of the infective larvae L3 have also been reported, with H.

In Australia, significant observable genetic and phenotypic divergences were found between isolates of H. Haemonchus placei presented higher mean spicule and barb lengths than H. Sheep and cattle grazing alternately: Fill in your details below or click an icon to log in: The differences between Cooperia spp. In a pioneering study in Australia, Keith observed that Haemonchus infective larvae from cattle were longer and more robust than those from sheep and had a tail with a much longer whip-like filament.

It is important to emphasize, however, that identification of third stage larvae requires very well trained staff, especially when animals present mixed nematode infections.

Nematode parasitism and pasture decontamination. Rev Bras Parasitol Vet ; 20 4: Diagnosis; Trichostrongyloidea; molecular biology; ruminants; epidemiology.


Haemonchus placei

Some species can infect plants. Trichostrongyloidea and identification of PCR primers for rapid differentiation.

Haemonchus placei in cattle has never been completely described, possibly due to great morphological similarity with small ruminants Haemonchus contortus.

A third haemonnchus of lambs was single challenged with either H. Molecular identification by PCR and morphometrics means followed by size range in parentheses of male specimens of Haemonchus contortus and Haemonchus placei.

Nematodes, also called roundworms, are worm-shaped animals. J Helminthol ; 8 4: Universidade Federal de Santa Maria; Differentiation of Haemonchus placei from Haemonchus contortus by PCR and by morphometrics of adult parasites and third stage larvae. These PCR results were used as gold standard for Haemonchus spp. Int J Parasitol ; 27 Host specificity of Haemonchus spp. Moreover, the larvae of females established in sheep from larvae taken from cattle maintained their cattle-type and vice versa, which is in agreement with our results.

To find out more, including how to control cookies, see here: The chemical structure of Ivermectin. The cycling conditions were as follows: However, some measurements overlapped.

Unexpected occurrence of Haemonchus placei in cattle in southern Western Australia.

A drop of larval suspension and the larvae killed with Lugol’s iodine solution were deposited on a glass microscope slide. Japan International Cooperation Agency; Helminthologia ; 51 2: New morphological characters for identifying individual specimens of Haemonchus spp.


Ten male Haemonchus worms per abomasum sample were randomly chosen for analysis, or all available specimens were analyzed when there were fewer than 10 parasites present. Species identification was established as follows ACHI et al.

Third stage larvae production and measurement Composite fecal cultures were prepared for each group of sheep with the feces of donor lambs infected with H. Parasitology ; 71 3: Biological characterization and pathogenicity of three Haemonchus contortus isolates in primary infections in lambs.

What diseases does Haemonchus placei cause? Materials and Methods Collection and examination of nematodes Male specimens were obtained from lambs Ovis aries artificially infected with H. They can infect most mammals, birds, fish, reptiles, lizards and insects.

Haemonchus placei – WormBase ParaSite

Aust J Zool ; 2 2: In the present study, we evaluated molecular and morphological methods for distinguishing between H. Services on Demand Journal. Comparison of strategies to provide lambing paddocks of low gastro-intestinal nematode infectivity in a summer rainfall region of Australia.