J. Anim Sci.
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J. Anim Sci. 1971. 32:1195-1201.
© 1971 American Society of Animal Science
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59Fe Retention in Sheep as a Function of Age and of Artificially Induced Parasitism with Haemonchus Contortus1

J. J. B. Anderson2, S. C. Bautista3, J. R. Posada4, W. C. Crackel2 and E. E. Hatfield5, 6,

University of Illinois7, Urbana 61801

Abstract

HAEMONCHUS contortus has long been recognized as a serious intestinal helminth parasite of sheep. The blood loss in nearly mature pasture-raised sheep caused by H. contortus has been measured by whole-body counting of injected iron-59 (59Fe) by Georgi (1964). Clark, Kiesel and Goby (1962) experimentally infected mature sheep with H. contortus and estimated blood loss by the appearance of fecal radioactivity following the injection of radio-labeled erythrocytes. However, quantitative measurements of blood loss in these studies have been incomplete, because of the use of too few animals, the lack of information on the effect of age on iron retention, and the lack of use of both experimental infections and whole-body counting together in similarly aged animals. Wholebody counting is certainly not the only method of estimating blood loss, but it is perhaps the most quantitatively accurate method.

The objectives of the experiments reported here were to determine how 59Fe retention in sheep was influenced by age and to compare whole-body 59Fe retention of immature and mature sheep artificially administered a quantitative dose of H. contortus larvae.

Footnotes

1 This work was partially supported by U. S. Atomic Energy Commission Grant AT(I1-1)-1339.

2 Department of Veterinary Physiology and Pharmacology, College of Veterinary Medicine, University of Illinois, Urbana 61801.

3 Present address: Philippine Atomic Energy Commission, 727 Herran Street, Manilla. Philippines.

4 Present address: Instituto de Asuntos Nucleares, Bogota, D. E. Columbia.

5 Department of Animal Science, College of Agriculture, University of Illinois, Urbana 61801.

6 Appreciation is expressed to: Dr. Ray E. Olsen for the clinical laboratory determinations: Dr. Kenneth S. Todd, Jr. for preparing H. contortus larvae and for fecal examinations; Dr. Timothy G. Lohman for use of ILLASCO; Mr. Andrew Milkowski for statistical analysis; and to Mr. C. K. Hsu, Mr. Richard Anderson, Mr. Terrv Brockmeyer and Mr. Bennie Doane for technical assistance. Special thanks are due to Dr. Todd for a critical reading of the manuscript.

7 Departments of Veterinary Physiology and Pharmacology and Animal Science.






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