Data/hora: 16/06/2024 06:38:56

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 26/07/1995
Data da última atualização: | 26/07/1995
Autoria: | HERLICH, H.; PORTER, D. A.; KNIGHT, R. A.
Título: | A study of Haemonchus in cattle and sheep.
Ano de publicação: | 1958
Fonte/Imprenta: | American Journal of Veterinary Research, v.19, p.866-872, Oct. 1958.
Idioma: | Inglês
Conteúdo: | 1) A study was made of 2,716 male and 2,880 female Haemonchus recovered from cattle and sheep that acquired their infections by grazing on pastures contaminated with Haemonchus of bovine or ovine origin, and from other animals that had been experimentally infected. 2) The mean measurements of spicule lenght and of the distances from the hooks to the tips of the spicules of the bovine strain were significantly greater than those of the ovine strain. The differences in spicule measurements between the two strains were present regardless of the ultimate host, indicating that mean measurements of spicules were not affected by the host. 3) Of the ovine strain females examined, 72 per cent had a short, knoblike vulval process, 20 per cent had a long, linguiform process typical of the ovine strain, and 8 per cent had processes with other configurations. However, 68 per cent of the ovine strain examined had a long, linguiform process, 3 per cent a short knoblike process, and 28 per cent had vulval processes with miscellaneous configurations. 4) Bovine strain worms recovered from experimentally infected lambs were significantly shorter than those recovered from similarly infected calves. The opposite was true of thje ovine strain. 5) More worms were aharbored by calves experimentally infected with the bovine strain than by lambs similarly infected, whereas the opposite was true for the ovine strain. 6) Limited blood studies indicated that ovine strain Haemonchus caused a reduction in packed erythrocyte volume in both lambs and calves, while the bovine strain worms reduced packed cell vlume markedly in calves but apparently had little effect on cell volume in lambs. 7) The prepatent periods of infection different between the two strains. 8) The evidence indicates that the two strains involved in this study were comparable to the two species of Haemonchus advanced by the Australian workers, i.e., H. placei and H. contirtus, normal parasites of cattle and sheep, respectively.
Palavras-Chave: | Parasita; Parasite.
Thesagro: | Carneiro; Gado; Haemonchus Contortus.
Thesaurus Nal: | cattle; Haemonchus placei; sheep.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (28696-1) - ADD - SP - -- - SP0386 -  - 0386 - DIS