Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-19T22:35:08.382Z Has data issue: false hasContentIssue false
  • English
  • Français

Studies on Eimeria praecox Johnson, 1930, in the chicken

Published online by Cambridge University Press:  06 April 2009

P. L. Long
P. L. Long
Affiliation:
Houghton Poultry Research Station, Houghton, Huntingdon, England
Get access Rights & Permissions [Opens in a new window]

Extract

E. praeox has been isolated in Britain for the first time and is similar in regard to its oocyst size, prepatent time, life-cycle and the development of host immunity to the reports of Tyzzer et al. (1932). Oocysts had mean dimensions of 20·4 × 17·45 μm and the first oocysts were discharged 83½ h after infection.

Oocyst production and life-cycle studies suggest that at least three generations of schizogony precede gametogony and that at least one further generation of schizogony is needed to explain the oocyst reproduction resulting from a small dose of oocysts. Young chickens 1½–3 weeks of age were not such suitable hosts as older chickens (6 weeks) and the reproduction of the parasite was seriously reduced when large numbers (e.g. 105, 106) were used to infect chickens. A high degree of resistance to reinfection occurred after a single exposure to infection.

Sporozoite infections of the caeca or cloaca resulted in the infection of the usual small intestine site; there was no development at the site of inoculation and attempts to infect the embryo allantois did not succeed.

I wish to thank Dr M. Elaine Rose for the surgery required for the caecal infections, for her interest throughout and for help with the manuscript; Dr R. F. Gordon for help with the manuscript and permission to publish and Mr B. J. Millard for skilled technical assistance.

Type
Research Article
Information
Parasitology , Volume 57 , Issue 2 , May 1967 , pp. 351 - 361
Copyright
Copyright © Cambridge University Press 1967

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

REFERENCES

Doran, D. J. & Farr, M. M. (1961). In vitro excystation of Eimeria acervulina. J. Parasit. 47, suppl. 4, Sect. 2, 48 (Abstr.).Google Scholar
Edgar, S. A. & Siebold, C. T. (1964). A new coccidium of chickens, Eimeria mivati sp.n. (Protozoa: Eimeriidae) with details of its life history. J. Parasit. 50, 193–204.CrossRefGoogle ScholarPubMed
Freeman, B. M. (1963). The gaseous metabolism of the domestic chicken. III. The oxygen requirement of the chicken during the period of rapid growth. Br. Poult. Sci. 4, 169–78.CrossRefGoogle Scholar
Horton-Smith, C. & Long, P. L. (1965). The development of Eimeria necatrix Johnson, 1930 and Eimeria brunetti Levine, 1942 in the caeca of the domestic fowl (Gallus domesticus). Parasitology 55, 401–5.CrossRefGoogle Scholar
Horton-Smith, C. & Long, P. L. (1966). The fate of the sporozoites of Eimeria acervulina, Eimeria maxima and Eimeria mivati in the caeca of the fowl. Parasitology 56, 569–74.CrossRefGoogle ScholarPubMed
Johnson, W. T. (1930). Coccidiosis of the chicken with special reference to species. Stn. Bull. Ore. agric. Exp. Stn. 358, 3–33.Google Scholar
Long, P. L. (1959). A study of Eimeria maxima Tyzzer 1929, a coccidium of the fowl. Ann. trop. Med. Parasit. 53, 325–33.CrossRefGoogle ScholarPubMed
Long, P. L. (1966). The growth of some species of Eimeria in avian embryos. Parasitology 56, 575–81.CrossRefGoogle ScholarPubMed
Long, P. L. & Rowell, J. G. (1958). Counting oocysts of chicken coccidia. Lab. Pract. 7, 515–19.Google Scholar
Tyzzer, E. E., Theiler, H. & Jones, E. E. (1932). Coccidiosis in gallinaceous birds. II. A comparative study of Eimeria of the chicken. Am. J. Hyg. 15, 319–93.Google Scholar