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Breed differences in copper metabolism in sheep

  • G. Wiener (a1), N. F. Suttle (a1) (a2), A. C. Field (a1) (a2), J. G. Herbert (a1) and J. A. Woolliams (a1)...
Summary

Evidence was sought for genetic differences in the absorption or systemic use of copper by comparing responses in plasma Cu concentration to oral and intravenous Cu repletion. Lambs of the North Ronaldsay (Orkney), Scottish Blackface and Welsh Mountain breeds and crosses of these with the North Ronaldsay were used.

In two oral repletion phases average Cu intakes/kg live weight were 0·87 and 0·63 mg/week and similar for all breed groups. Plasma Cu concentrations of Scottish Blackface lambs showed little or no increase while those of North Ronaldsay lambs increased rapidly, and those of Welsh Mountain lambs increased moderately. The plasma Cu concentrations of the cross-breds increased more rapidly in the first than in the second phase; their rate of change lay between the pure breeds but was closer to that of the North Ronaldsay in the first phase.

The rates of increase in plasma Cu concentration during intravenous repletion were relatively uniform for the different breeds and crosses except the Blackface which showed a lower rate. It was concluded that the large differences between groups in response to oral Cu repletion were largely attributable to differences in the efficiency of Cu absorption.

Copyright
COPYRIGHT: © Cambridge University Press 1978
References
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Herbert, J. G., Wiener, G. & Field, A. C. (1978). The effect of breed and of dried seaweed meal in the diet on the levels of copper in liver, kidney and plasma of sheep fed a high Cu diet. Animal Production 26, 193–201.
Suttle, N. F. (1974). A technique for measuring the biological availability of copper to sheep, using hypocupraemic ewes. British Journal of Nutrition 32, 395–405.
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Wiener, G., Field, A. C. & Smith, Carol (1977). Deaths from copper toxicity of sheep at pasture and the use of fresh seaweed. Veterinary Record 101, 424–425.
Wiener, G., Field, A. C. & Wood, Jean (1969). The concentration of minerals in the blood of genetically diverse groups of sheep. I. Copper concentrations at different seasons in Blackface, Cheviot, Welsh Mountain and crossbred sheep at pasture. Journal of Agricultural Science, Cambridge 72, 93—101.
Wiener, G., Hall, J. G., Hayter, Susan, Field, A. C. & Suttle, N. F. (1974a). Relationships between haemoglobin type and copper concentrations in whole blood and its components in sheep of different breeds. Animal Production 19, 291–299.
Wiener, G., Herbert, J. G. & Field, A. C. (1976). Variation in liver and plasma copper concentrations of sheep in relation to breed and haemoglobin type. Journal of Comparative Pathology 86, 101–109.
Wiener, G., Hayter, S., Field, A. C. & MaCleod, N. S. M. (1974b). Copper levels in liver and brain of dead lambs in relation to breed, age at death and cause of death. Journal of Comparative Pathology 84, 27–38.
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