Data/hora: 11/06/2024 09:19:48

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 15/08/1995
Data da última atualização: | 15/08/1995
Autoria: | ARMOUR, J.; . JENNINGS, F. W.; URQUHART, G. M.
Título: | Inhibition of Ostertagia ostertagi at the early fourth larval stage. II.The influence of environment on host or parasite.
Ano de publicação: | 1969
Fonte/Imprenta: | Research Veterinary Science, v.10, n.3, p.238-244, 1969.
Idioma: | Inglês
Conteúdo: | Groups of 4 susceptible worm-free calves were grazed in late autumn on paddocks of equal area which had been contaminated at different times of the year with a laboratory culture of Ostertagia ostertagi or with O. ostertagi derived from a natual field infection. Further susceptible calves were grazed in a worm-free paddock and inoculated orally with O. ostertagi larvae cultured in the laboratory. In the calves inoculated orally only negligible numbers of inhibited O. ostertagi were present, but inhibited fourth stage larvae were a feature of the worm burdens of all the calves which ingested larvae developed at pasture. A significantly higher propoetion of inhibited fourth stage larvae was found in the worm burdens of calves which gad grazed on the paddock contamined with the natural field infection. It was concluded that inhibition of larval develeopment in naturally occurring bovine ostertagiasis was primarily dependent on 2 factors: an innate susceptibility of a particular strain of larvae to inhibitiona and the environmental circunstances of late autum which, acting on larvae on pasture, produce an optimal stimulus for the subsequent inhibitiona of ingested larvae.
Palavras-Chave: | Host; Lombriga; Parasita; Parasite; Worm-free.
Thesagro: | Hospedeiro; Meio Ambiente.
Thesaurus Nal: | environment; Ostertagia ostertagi.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (29178-1) - ADD - SP - -- - SP0846 -  - 0846 - DIS