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The response of Awassi sheep to re-infection with Haemonchus contortus larvae

Published online by Cambridge University Press:  06 April 2009

K. I. Altaif ,
S. N. Al-Abbassy  and
H. B. Abboud
K. I. Altaif
Affiliation:
Department of Parasitology, College of Veterinary Medicine, University of Baghdad, Al-Ameria (Iraq)
S. N. Al-Abbassy
Affiliation:
Department of Parasitology, College of Veterinary Medicine, University of Baghdad, Al-Ameria (Iraq)
H. B. Abboud
Affiliation:
Department of Parasitology, College of Veterinary Medicine, University of Baghdad, Al-Ameria (Iraq)
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Summary

The response of Awassi sheep to primary infection with 10000 Haemonchus contortus larvae and subsequent challenge with 20000 larvae was studied. Two types of response to re-infection were observed. The first, characterized by a sharp decline in egg counts, progressive improvement in packed cell volume (PCV) and a marked loss of adult worms and challenge larvae, was considered as self-cure and protection. In the second type of response there was a temporary decline in egg counts, no improvement in PCV and necropsy findings indicated hyperinfection with challenge larvae.

Type
Research Article
Information
Parasitology , Volume 80 , Issue 2 , April 1980 , pp. 233 - 240
Copyright
Copyright © Cambridge University Press 1980

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