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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
07/12/1995 |
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Data da última atualização: |
10/05/2023 |
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Autoria: |
SUAREZ, V. H.; BUSETTI, M. R. |
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Título: |
The epidemiology of helminth infections of growing sheep in Argentina's western pampas. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
International Journal for Parasitology, v. 25, n. 4, p. 489-494, Apr., 1995. |
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DOI: |
10.1016/0020-7519(94)00122-5 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Seasonal population trends of helminth parasites of growing lambs were investigated over 4 years. Successive worm-free lambs were grazed together with untreated lambs for 20-30 days and then slaughtered for helminth counts 2 weeks after their removal from pasture. Likewise untreated lambs from the same flock were slaughtered from 2 to 15 months of age for worm counts in the same way as tracer lambs. The predominant parasites were Haemonchus, Nematodirus and Trichostrongylus. Haemonchus contortus was found to be of major importance and the flock acquired massive worm burdens from summer to mid-autumn. Minimum burdens were seen from winter to early spring and maximum L4 stages were found from mid-autumn to early winter. Nematodirus burdens increased from December with a peak in late summer and then decreased to low values. Maximum larval availability was in autumn to early winter. Trichostrongylus (mainly T. colubriformis) populations increased in autumn and peaked in June-July, while the highest larval availability was in autumn. The minor genera recovered were Ostertagia, Cooperia, Trichuris, Oesophagostomum and Moniezia. Dictyocaulus, Chabertia and Teladorsagia were noted occasionally and liver flukes were not detected. No important and pathogenic numbers of L4 stages were seen and all predominant species were able to survive over summer or winter in pasture. |
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Palavras-Chave: |
Haemonchiasis; Nematodeo gastrintestinal; Parasite Egg Count; Tracer lambs. |
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Thesagro: |
Epidemiologia; Ovino; Parasitologia. |
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Thesaurus Nal: |
Argentina; Epidemiology; Gastrointestinal nematodes; Helminths; Mortality; Nematode infections; Seasons; Sheep diseases; Survival rate. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02372naa a2200337 a 4500
001 1522192
005 2023-05-10
008 1995 bl uuuu u00u1 u #d
024 7 $a10.1016/0020-7519(94)00122-5$2DOI
100 1 $aSUAREZ, V. H.
245 $aThe epidemiology of helminth infections of growing sheep in Argentina's western pampas.$h[electronic resource]
260 $c1995
520 $aAbstract: Seasonal population trends of helminth parasites of growing lambs were investigated over 4 years. Successive worm-free lambs were grazed together with untreated lambs for 20-30 days and then slaughtered for helminth counts 2 weeks after their removal from pasture. Likewise untreated lambs from the same flock were slaughtered from 2 to 15 months of age for worm counts in the same way as tracer lambs. The predominant parasites were Haemonchus, Nematodirus and Trichostrongylus. Haemonchus contortus was found to be of major importance and the flock acquired massive worm burdens from summer to mid-autumn. Minimum burdens were seen from winter to early spring and maximum L4 stages were found from mid-autumn to early winter. Nematodirus burdens increased from December with a peak in late summer and then decreased to low values. Maximum larval availability was in autumn to early winter. Trichostrongylus (mainly T. colubriformis) populations increased in autumn and peaked in June-July, while the highest larval availability was in autumn. The minor genera recovered were Ostertagia, Cooperia, Trichuris, Oesophagostomum and Moniezia. Dictyocaulus, Chabertia and Teladorsagia were noted occasionally and liver flukes were not detected. No important and pathogenic numbers of L4 stages were seen and all predominant species were able to survive over summer or winter in pasture.
650 $aArgentina
650 $aEpidemiology
650 $aGastrointestinal nematodes
650 $aHelminths
650 $aMortality
650 $aNematode infections
650 $aSeasons
650 $aSheep diseases
650 $aSurvival rate
650 $aEpidemiologia
650 $aOvino
650 $aParasitologia
653 $aHaemonchiasis
653 $aNematodeo gastrintestinal
653 $aParasite Egg Count
653 $aTracer lambs
700 1 $aBUSETTI, M. R.
773 $tInternational Journal for Parasitology$gv. 25, n. 4, p. 489-494, Apr., 1995.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
