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In vivo leucine oxidation in the gastrointestinal tract of lambs infected with nematode parasite Trichostrongylus colubriformis

Published online by Cambridge University Press:  20 November 2017

Feng Yu ,
L.A. Bruce ,
R.L. Coop ,
F Jackson  and
J.C. MacRae
Feng Yu
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB21 9SB, U.K.
L.A. Bruce
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB21 9SB, U.K.
R.L. Coop
Affiliation:
Moredun Research Institute, Pentlands Science Park, Penicuik, Midlothian, EH26 0PZ, U.K.
F Jackson
Affiliation:
Moredun Research Institute, Pentlands Science Park, Penicuik, Midlothian, EH26 0PZ, U.K.
J.C. MacRae
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB21 9SB, U.K.
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Extract

One major consequence of the presence of the nematode parasites in the gastrointestinal tract (GIT) of ruminants appears to be an elevated flow of endogenous N component from the small intestine, leading to adverse changes in host productivity (MacRae, 1993). However, many of these aspects have remained speculative because of a lack of appropriate methodology to quantify the influence of parasites on GIT protein metabolism. In the present study oxidation of leucine sequestrated from arterial blood and digesta-derived leucine during “first pass” metabolism in the GIT of lambs subjected to subclinical T. colubriformis infection were quantified directly, using trans-organ catheterisation procedures coupled with stable isotope tracer kinetics.

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Proceedings of the British Society of Animal Science , Volume 1999 , 1999 , pp. 107
Copyright
Copyright © The British Society of Animal Science 1999

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References

MacRae, J.C. 1993.Metabolic consequences of intestinal parasitism. Proc.of the Nutrition Society 52: 121–130.Google Scholar
MacRae, J.C., Bruce, L.A., Brown, D.S. & Calder, A.G. 1997. Amino acid use by the gastrointestinal tract of sheep given lucerne forage. American Journal of Physiology 273: G1200–G1207.Google Scholar