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Effects of a series of infections of Ostertagia circumcincta on gastric secretion of sheep

Published online by Cambridge University Press:  06 April 2009

N. Anderson ,
R. Blake  and
D. A. Titchen
N. Anderson
Affiliation:
Animal Health Division of the C.S.I.R.O.,University of Melbourne, Parkville, Victoria 3052, Australia
D. A. Titchen
Affiliation:
Department of Veterinary Preclinical Sciences,University of Melbourne, Parkville, Victoria 3052, Australia
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Summary

Sheep which had been either previously infected with O. circumcincta or maintained worm-free, were surgically prepared with separated fundic pouches and abomasal cannulae and subsequently infected with 20000 O. circumcincta larvae three times weekly.

A reduction in food intake and increases in total acid output from the pouches and plasma pepsinogen levels were evident in both groups of sheep 4 days after repeated infections commenced; effects which increased in severity after 12 or more days. Except for a transient period of slight failure, previously infected sheep retained the capacity to acidify their abomasal contents whereas previously worm-free sheep lost this capacity. These changes were reversed between 2 and 7 days after treatment with thiabendazole (88 mg.kg−1).

Secretory capacity of the fundic pouches was tested with histamine (40 μg.kg−1), the histamine antagonist (burimamide 8mg.kg−1) and atropine (100 μg kg−1). Ostertagiasis reduced or abolished the stimulatory effects of histamine. An increase in secretion volume and acid output was obtained after food was freshly provided, even though as little as 25 gm was consumed. Atropine and burimamide both caused a profound decrease in pouch secretion and acid output.

These data are consistent with the hypothesis previously stated that in ostertagiasis the hypersecretion from fundic pouches is due to increased levels of circulating gastrin.

Type
Research Article
Information
Parasitology , Volume 72 , Issue 1 , February 1976 , pp. 01 - 12
Copyright
Copyright © Cambridge University Press 1976

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References

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