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The pathogenic effects of Eimeria praecox and E. acervulina in the chicken

  • P. L. Long (a1)

Eimeria praecox produced less effect on body-weight gain and food consumption than E. acervulina. No deaths occurred and no weight loss followed infection with doses of oocysts up to 10. However, there was a depression of body-weight gain in birds infected with both species and changes in the permeability of the intestine were noted from as early as 3½ h after infection. This suggests that increased intestinal permeability is not the major factor in the greater pathogenicity of E. acervulina compared with E. praecox. Eimeria acervulina produced considerably greater effects on the host as evidenced by mortality, body weight gain and food consumption.

I wish to thank Mr B. J. Millard and Mr M. Shirley for technical assistance and Dr B. M. Freeman for help with the statistics in Table 2.

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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.
Johnson, W. T. (1930). Coccidiosis of the chicken with special reference to species. Stn Bull. Ore. agric. Exp. Stn 358, 333.
Long, P. L. (1967 a). Studies on Eimeria praecox Johnson, 1930, in the chicken. Parasitology 57, 351–61.
Long, P. L. (1967 b). Studies on Eimeria mivati in chickens and a comparison with Eimeria acervulina. J. comp. Path. Ther. 77, 315–25.
Long, P. L. (1968). The effect of breed of chickens on resistance to Eimeria infections. Br. Poult. Sci. 9, 71–8.
Long, P. L. & Rowell, J. G. (1958). Counting oocysts of chicken coccidia. Lab. Pract. 7, 515–19.
Morehouse, N. F. & McGuire, W. C. (1958). The pathogenicity of Eimeria acervulina. Poult. Sci. 37, 665–72.
Preston-Mafham, R. A. & Sykes, A. H. (1967). Changes in the permeability of the mucosa during intestinal coccidiosis infections of the fowl. Experientia 23, 972–3.
Tyzzer, E. E., Theiler, H. & Jones, E. E. (1932). Coccidiosis in gallinaceous birds. II. A comparative study of Eimeria in the chicken. Am. J. Hyg. 15, 319–93.
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  • ISSN: 0031-1820
  • EISSN: 1469-8161
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