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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
03/08/2023 |
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Autoria: |
BARGER, I. A.; LE JAMBRE, L. F.; GEORGI, J. R.; DAVIES, H. I. |
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Título: |
Regulation of Haemonchus contortus populations in sheep exposed to continuous infection. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
International Journal of Parasitology, v. 15, n. 5, p. 529-533, Oct. 1985. |
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DOI: |
https://doi.org/10.1016/0020-7519(85)90049-9 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Groups of sheep were infected three times weekly for 15 weeks with infective larvae of Haemonchus contortus at four rates ranging from 600 to 4800 larvae per week. At 3-weekly intervals, sheep from each group were killed for total worm counts after receiving a dose of radiolabelled larvae which enabled a direct measurement of establishment of incoming larvae during the continuing infection. Peak H. contortus burdens were reached between 6 and 9 weeks of infection, and were related to infection rate. In the groups receiving 2400 and 4800 larvae per week, worm numbers then declined rapidly and by the end of the experiment were lower than those in the groups given 600 or 1200 larvae per week. Establishment of incoming larvae was not influenced by infection rate, and declined from 45% in the first 4 weeks of infection to insignificant levels during the final 6 weeks. The proportion of incoming larvae arrested in their development increased as the infection progressed. It was concluded that H. contortus numbers were regulated by development of resistance to infection and by a loss of established worms which was related to the current rate of larval intake, and to the host's previous experience of infection. |
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Palavras-Chave: |
Endoparasitos; Establishment; Nematodeos; Population regulation. |
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Thesagro: |
Haemonchus Contortus; Imunologia; Larva; Ovino; Parasitologia. |
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Thesaurus Nal: |
Disease control; Disease prevention; Gastrointestinal nematodes; Larvae; Parasitology; Pathogenicity; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02276naa a2200361 a 4500
001 1522017
005 2023-08-03
008 1985 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/0020-7519(85)90049-9$2DOI
100 1 $aBARGER, I. A.
245 $aRegulation of Haemonchus contortus populations in sheep exposed to continuous infection.$h[electronic resource]
260 $c1985
520 $aAbstract: Groups of sheep were infected three times weekly for 15 weeks with infective larvae of Haemonchus contortus at four rates ranging from 600 to 4800 larvae per week. At 3-weekly intervals, sheep from each group were killed for total worm counts after receiving a dose of radiolabelled larvae which enabled a direct measurement of establishment of incoming larvae during the continuing infection. Peak H. contortus burdens were reached between 6 and 9 weeks of infection, and were related to infection rate. In the groups receiving 2400 and 4800 larvae per week, worm numbers then declined rapidly and by the end of the experiment were lower than those in the groups given 600 or 1200 larvae per week. Establishment of incoming larvae was not influenced by infection rate, and declined from 45% in the first 4 weeks of infection to insignificant levels during the final 6 weeks. The proportion of incoming larvae arrested in their development increased as the infection progressed. It was concluded that H. contortus numbers were regulated by development of resistance to infection and by a loss of established worms which was related to the current rate of larval intake, and to the host's previous experience of infection.
650 $aDisease control
650 $aDisease prevention
650 $aGastrointestinal nematodes
650 $aLarvae
650 $aParasitology
650 $aPathogenicity
650 $aSheep
650 $aHaemonchus Contortus
650 $aImunologia
650 $aLarva
650 $aOvino
650 $aParasitologia
653 $aEndoparasitos
653 $aEstablishment
653 $aNematodeos
653 $aPopulation regulation
700 1 $aLE JAMBRE, L. F.
700 1 $aGEORGI, J. R.
700 1 $aDAVIES, H. I.
773 $tInternational Journal of Parasitology$gv. 15, n. 5, p. 529-533, Oct. 1985.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
22/04/2010 |
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Data da última atualização: |
20/02/2013 |
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Tipo da produção científica: |
Boletim de Pesquisa e Desenvolvimento |
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Autoria: |
MAGNABOSCO, C. de U.; BARBOSA, V.; FARIA, C. de U.; LOPES, D. T.; VIU, M. A. de O.; MAMEDE, M. M. S.; LÔBO, R. B. |
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Afiliação: |
CLAUDIO DE ULHOA MAGNABOSCO, CPAC; VANESSA BARBOSA, ABCZ; CARINA DE UBIRAJARA FARIA, UFG; DYOMAR TOLEDO LOPES, UFG; MARCO ANTÔNIO DE OLIVEIRA VIU, UFG; MARIANA MÁRCIA SANTOS MAMEDE, AGCZ; RAYSILDO BARBOSA LÔBO, ANCP. |
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Título: |
Estudo genético quantitativo de características de carcaça medidas por ultrassom e perímetro escrotal utilizando inferência bayesiana em novilhos nelore. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Planaltina, DF: Embrapa Cerrados, 2009. |
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Série: |
(Embrapa Cerrados. Boletim de Pesquisa e Desenvolvimento, 247) |
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Idioma: |
Português |
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Palavras-Chave: |
Beef catle; Meet. |
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Thesagro: |
Carne; Gado de corte; Gado nelore; Melhoramento genético animal. |
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Thesaurus NAL: |
Animal breeding. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://www.infoteca.cnptia.embrapa.br/infoteca/bitstream/doc/697248/1/bolpd247.pdf
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Marc: |
LEADER 00858nam a2200265 a 4500
001 1697248
005 2013-02-20
008 2009 bl uuuu u0uu1 u #d
100 1 $aMAGNABOSCO, C. de U.
245 $aEstudo genético quantitativo de características de carcaça medidas por ultrassom e perímetro escrotal utilizando inferência bayesiana em novilhos nelore.
260 $aPlanaltina, DF: Embrapa Cerrados$c2009
490 $a(Embrapa Cerrados. Boletim de Pesquisa e Desenvolvimento, 247)
650 $aAnimal breeding
650 $aCarne
650 $aGado de corte
650 $aGado nelore
650 $aMelhoramento genético animal
653 $aBeef catle
653 $aMeet
700 1 $aBARBOSA, V.
700 1 $aFARIA, C. de U.
700 1 $aLOPES, D. T.
700 1 $aVIU, M. A. de O.
700 1 $aMAMEDE, M. M. S.
700 1 $aLÔBO, R. B.
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