Author:
WALLACE D. S.,BAIRDEN K.,DUNCAN J. L.,ECKERSALL P. D.,FISHWICK G.,GILL M.,HOLMES P. H.,McKELLAR Q. A.,MURRAY M.,PARKINS J. J.,STEAR M. J.
Abstract
Previous research has indicated that supplementing an apparently
adequate diet with additional protein improves both
host resistance and resilience in lambs infected with
Haemonchus contortus. The present study tested the influence of
supplementation with non-protein nitrogen (urea). Helminth-naive
Hampshire Down lambs were given an apparently
adequate basal diet or a diet supplemented with urea. The lambs were
then infected with Haemonchus contortus for
10 weeks. Supplementation with urea had no discernible effect on
resistance to infection; faecal egg counts, worm burdens,
worm lengths and mean number of eggs per adult female worm did not
differ between the 2 groups. However, lambs on
the supplemented diet showed better resilience; they had greater
packed red cell volumes, higher plasma albumin
concentrations and increased liveweight gain compared to lambs on
the basal diet. The loss of appetite following infection
was less in lambs fed the urea-supplemented diet. The observed effect
of urea supplementation was seemingly due to
greater food consumption as well as the better diet.
Publisher
Cambridge University Press (CUP)
Subject
Infectious Diseases,Animal Science and Zoology,Parasitology
Cited by
25 articles.
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