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Effect of food intake on energy and protein metabolism in the skin of Romney sheep

Published online by Cambridge University Press:  09 March 2007

P. M. Harris ,
J. Lee ,
B. R. Sinclair ,
B. P. Treloar  and
M. P. Gurnsey
P. M. Harris
Affiliation:
AgResearch, Grasslands Research Centre, Private Bag 11008, Palmerston North, New Zealand
J. Lee
Affiliation:
AgResearch, Grasslands Research Centre, Private Bag 11008, Palmerston North, New Zealand
B. R. Sinclair
Affiliation:
AgResearch, Grasslands Research Centre, Private Bag 11008, Palmerston North, New Zealand
B. P. Treloar
Affiliation:
AgResearch, Grasslands Research Centre, Private Bag 11008, Palmerston North, New Zealand
M. P. Gurnsey
Affiliation:
AgResearch, Grasslands Research Centre, Private Bag 11008, Palmerston North, New Zealand
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Abstract

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Sheep fed on either a low (500 g lucerne (Medicago sativa) chaff/d; L) or high (1100 g lucerne chaff/d; H) intake had measurements made, using arterio–venous techniques, of blood flow and energy metabolite and cysteine utilization in the skin. Sheep on the H intake had significantly increased skin blood flow (P = 0.014) and oxygen uptake (P = 0.05). Although the H sheep had higher skin blood flow they showed no difference in skin uptake of either glucose or acetate compared with the L sheep, but the H sheep had a significantly lower output of lactate (P = 0.014). Animals in each group had either [14Clglucose or [14Clacetate infused into the skin which showed that acetate was the predominant precursor of skin sterol and fatty acid synthesis in the H sheep while L sheep skin used both glucose and acetate. The H sheep showed an increase in the net uptake of cysteine by the skin (P = 0.053), and in the uptake of cysteine for protein synthesis (P = 0.078), relative to the L sheep and this increase was of a comparable magnitude to the increase in blood now to the skin. Although blood flow, protein synthesis and energy supply increased in the skin of the H sheep by 200–300%, wool production would only have increased by 10–20 %, suggesting that nutrient flux changes are not the sole level of regulation of wool production.

Keywords

Skin energy metabolismCysteineFeed intakeSheep
Type
food intake on energy and protein metabolism in the skin of Romney sheep
Information
British Journal of Nutrition , Volume 71 , Issue 5 , May 1994 , pp. 647 - 660
Copyright
Copyright © The Nutrition Society 1994

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