Hostname: page-component-5c6d5d7d68-wbk2r Total loading time: 0 Render date: 2024-08-08T16:21:26.987Z Has data issue: false hasContentIssue false
  • English
  • Français

The differentiation of the eggs of Haemonchus contortus and Ostertagia species of the sheep and a note on the relative generic egg-laying rates

Published online by Cambridge University Press:  06 April 2009

J. H. Tetley
J. H. Tetley
Affiliation:
From the Zoology Department, Massy Agricultural College, Palmerston North, New Zealand
Get access Rights & Permissions [Opens in a new window]

Extract

1. In a mixed infection in which Haemonchus contortus, Ostertagia circumcincta and O. trifurcata predominated, the lengths were plotted against widths of eggs obtained from faeces.

2. Two-dimensional groups approximating to normal frequency distributions, showing little overlap, were observed.

3. The statistical ranges of means plus and minus twice the standard deviation for the two groups barely touched. These were, to the nearest micron, 68–84 by 41–51 for Haemonchus contortus and, for the Ostertagia group, 83–103 by 46–52.

Type
Research Article
Information
Parasitology , Volume 40 , Issue 3-4 , October 1950 , pp. 273 - 275
Copyright
Copyright © Cambridge University Press 1950

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Shorb, D. A. (1940). A comparative study of the eggs of various nematodes parasitic in domestic ruminants. J. Parasit. 24, 223–31.CrossRefGoogle Scholar
Tetley, J. H. (1941). Haemonchus contortus eggs; comparison of these in utero with those recovered from faeces and a statistical method for identifying H. contortus eggs in mixed infections. J. Parasit. 27, 433–63.CrossRefGoogle Scholar
Tetley, J. H. (1949). Rhythms in nematode parasitism in sheep. Parts I-VII. (In the Press.)Google Scholar
Wood, W. A. (1931). A note on the size of the eggs of some species of sheep worms. Rep. Inst. Anim. Path. Univ. Camb. no. 2, p. 220.Google Scholar