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Experimental infections of sheep showed that Haemonchus contortus caused increased levels of pepsinogen. The increase occurred earlier than in Ostertagia circumcincta infections. Experiments with naturally infected sheep have shown a direct relationship between the number of worms in the abomasum...

Kerboeuf, D.
Reiseburo Kuoni AG., Zurich, Switzerland
Proceedings of the 2nd International Symposium of Veterinary Laboratory Diagnosticians, 24-26 June, 1980, Lucerne, Switzerland, Volume II., 1980, pp 181-184