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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
21/05/1996 |
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Data da última atualização: |
27/08/2013 |
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Autoria: |
ANDREWS, J. S.; MALDONADO, J. F. |
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Título: |
The life history of Oesophagostomum radiatum, the common nodular worm of cattle. |
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Ano de publicação: |
1941 |
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Fonte/Imprenta: |
Bulletin Puerto Rico Agricultural Experiment Station, n.2, p.1-32, 1941. |
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Idioma: |
Inglês |
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Conteúdo: |
An experimental study of the life cycle of Oesophagostomum radiatum, the common nodular worm of cattle, is reported. the free-living portion of the life cycle of this nematode was found to be similar to that of Cooperia curticei, Trichostrongylus spp., and of other oeso- phagostomes. The ensheathed third stage infective larvae began to migrate from the charcoal-feces cultures held at room temperature (25 to 30 C.) on about the sixty day. On being swallowed by calves the larvae complete the second ecdysis, pass with the ingesta to the ileum, cecum, or colon, where they penetrate the intestinal wall 24 to 48 hours after infection. They remain within the intestinal wall about 10 days, growing from about 700 u to 2.0 mm. in lenght. During this period the cervical glands undergo considerable develop- ment and the provisional buccal capsule, the chief characteristic of the fourth stage larvae, develops. Sexual differentiation is first indicated during this stage by the position of the genital primordium which in the female moves posteriorly. On about the eighth or ninth day the larvae undergo the third ecdysis, becoming fourth stage larvae, and return to the lumen of the intestine on about the tenth day. Here in the cecum and colon they continue their development without agaon entering the mucosa. On the nineteenth day after infec- tion the fourth stage larvae had grown to a length of approximately 4.5 mm. and a few of them had completed the fourth ecdysis, thus becoming fifth stage or adult nematodes. During the fourth stage the reproductive systems of both sexes grow rapidly and the adult capsule forms. The males and females then grown to about 13.6 and 17.1 mm., respectively, mature, mate, and the females lay eggs which are found in the feces of the host 37 to 41 days after infection. The data are compared with those obtained by other investigators from studies on species of Oesophagostomum parasitic in other domestic animals and no marked differences were noted. MenosAn experimental study of the life cycle of Oesophagostomum radiatum, the common nodular worm of cattle, is reported. the free-living portion of the life cycle of this nematode was found to be similar to that of Cooperia curticei, Trichostrongylus spp., and of other oeso- phagostomes. The ensheathed third stage infective larvae began to migrate from the charcoal-feces cultures held at room temperature (25 to 30 C.) on about the sixty day. On being swallowed by calves the larvae complete the second ecdysis, pass with the ingesta to the ileum, cecum, or colon, where they penetrate the intestinal wall 24 to 48 hours after infection. They remain within the intestinal wall about 10 days, growing from about 700 u to 2.0 mm. in lenght. During this period the cervical glands undergo considerable develop- ment and the provisional buccal capsule, the chief characteristic of the fourth stage larvae, develops. Sexual differentiation is first indicated during this stage by the position of the genital primordium which in the female moves posteriorly. On about the eighth or ninth day the larvae undergo the third ecdysis, becoming fourth stage larvae, and return to the lumen of the intestine on about the tenth day. Here in the cecum and colon they continue their development without agaon entering the mucosa. On the nineteenth day after infec- tion the fourth stage larvae had grown to a length of approximately 4.5 mm. and a few of them had completed the fourth ecdysis, thus becoming fifth st... Mostrar Tudo |
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Palavras-Chave: |
Common nodular worm; Life cycle; Lombriga; Nematode; Parasita; Parasite. |
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Thesagro: |
Ciclo de Vida; Gado; Nematóide. |
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Thesaurus Nal: |
cattle; Oesophagostomum radiatum. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02710naa a2200265 a 4500
001 1788522
005 2013-08-27
008 1941 bl --- 0-- u #d
100 1 $aANDREWS, J. S.
245 $aThe life history of Oesophagostomum radiatum, the common nodular worm of cattle.
260 $c1941
520 $aAn experimental study of the life cycle of Oesophagostomum radiatum, the common nodular worm of cattle, is reported. the free-living portion of the life cycle of this nematode was found to be similar to that of Cooperia curticei, Trichostrongylus spp., and of other oeso- phagostomes. The ensheathed third stage infective larvae began to migrate from the charcoal-feces cultures held at room temperature (25 to 30 C.) on about the sixty day. On being swallowed by calves the larvae complete the second ecdysis, pass with the ingesta to the ileum, cecum, or colon, where they penetrate the intestinal wall 24 to 48 hours after infection. They remain within the intestinal wall about 10 days, growing from about 700 u to 2.0 mm. in lenght. During this period the cervical glands undergo considerable develop- ment and the provisional buccal capsule, the chief characteristic of the fourth stage larvae, develops. Sexual differentiation is first indicated during this stage by the position of the genital primordium which in the female moves posteriorly. On about the eighth or ninth day the larvae undergo the third ecdysis, becoming fourth stage larvae, and return to the lumen of the intestine on about the tenth day. Here in the cecum and colon they continue their development without agaon entering the mucosa. On the nineteenth day after infec- tion the fourth stage larvae had grown to a length of approximately 4.5 mm. and a few of them had completed the fourth ecdysis, thus becoming fifth stage or adult nematodes. During the fourth stage the reproductive systems of both sexes grow rapidly and the adult capsule forms. The males and females then grown to about 13.6 and 17.1 mm., respectively, mature, mate, and the females lay eggs which are found in the feces of the host 37 to 41 days after infection. The data are compared with those obtained by other investigators from studies on species of Oesophagostomum parasitic in other domestic animals and no marked differences were noted.
650 $acattle
650 $aOesophagostomum radiatum
650 $aCiclo de Vida
650 $aGado
650 $aNematóide
653 $aCommon nodular worm
653 $aLife cycle
653 $aLombriga
653 $aNematode
653 $aParasita
653 $aParasite
700 1 $aMALDONADO, J. F.
773 $tBulletin Puerto Rico Agricultural Experiment Station$gn.2, p.1-32, 1941.
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Embrapa Pantanal (CPAP) |
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