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Whole-body valine and cysteine kinetics and tissue fractional protein synthesis rates in lambs fed Sulla (Hedysarum coronarium) and infected or not infected with adult Trichostrongylus colubriformis

Published online by Cambridge University Press:  08 March 2007

Emma N. Bermingham ,
Warren C. McNabb ,
Ian A. Sutherland ,
Bruce R. Sinclair ,
Bryan P. Treloar  and
Nicole C. Roy
Emma N. Bermingham
Affiliation:
Nutrition and Metabolism Section, Food and Health Group, AgResearch Grasslands, Palmerston North, New Zealand
Warren C. McNabb*
Affiliation:
Nutrition and Metabolism Section, Food and Health Group, AgResearch Grasslands, Palmerston North, New Zealand
Ian A. Sutherland
Affiliation:
Animal Health Group, AgResearch Grasslands, Palmerston North, New Zealand
Bruce R. Sinclair
Affiliation:
Nutrition and Metabolism Section, Food and Health Group, AgResearch Grasslands, Palmerston North, New Zealand
Bryan P. Treloar
Affiliation:
Nutrition and Metabolism Section, Food and Health Group, AgResearch Grasslands, Palmerston North, New Zealand
Nicole C. Roy*
Affiliation:
Nutrition and Metabolism Section, Food and Health Group, AgResearch Grasslands, Palmerston North, New Zealand
*
*Corresponding authors: Dr Nicole Roy and Dr Warren McNabb, fax + 64 6 351 8003, email nicole.roy@agresearch.co.nz, email warren.mcnabb@agresearch.co.nz
*Corresponding authors: Dr Nicole Roy and Dr Warren McNabb, fax + 64 6 351 8003, email nicole.roy@agresearch.co.nz, email warren.mcnabb@agresearch.co.nz
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Abstract

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Poor growth during parasitic infection may be due to a redistribution of amino acids away from skeletal muscle protein synthesis to the intestinal site of infection. The effect of a Trichostrongylus colubriformis infection on whole-body amino acid kinetics and tissue fractional protein synthesis rates were determined in lambs fed fresh Sulla (Hedysarum coronarium; 800g DM/d). Lambs were dosed with 6000 L3 Trichostrongylus colubriformis larvae daily for 6d (n 6) or kept as parasite-free controls (n 6). On day 45 post-infection, the lambs received an intravenous injection of 2H2O and infusions (8h) of [35S]sulphate to measure the size of the whole-body water and sulphate pools, respectively. On day 48, the lambs were continuously infused for 8h with [3,4-3H]valine into the jugular vein as well as with [1-13C]valine and [35S]cysteine into the abomasum. After the 8h infusions, the lambs were killed and tissue samples collected from the duodenum, ileum, mesenteric lymph nodes, liver, spleen, thymus, muscle and skin. Feed intake (769 v. 689 (sd 47) g DM/d) was not affected by infection, whereas liveweight gains (50 v. −50 (sd 70) g/d) were lower and intestinal worm burdens(240 v. 18 000 (sd 7000) worms) higher in the infected lambs. Parasitic infection increased the fractional protein synthesis rates in the small intestine, mesenteric lymph nodes and liver but did not affect skin and skeletal muscle fractional protein synthesis rates during the established parasitic infection.

Keywords

Parasite infectionWhole-body amino acid kineticsTissue protein synthesisSheep
Type
Research Article
Information
British Journal of Nutrition , Volume 96 , Issue 1 , January 2006 , pp. 28 - 38
Copyright
Copyright © The Nutrition Society 2006

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