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Use of soluble glass rumen boluses to provide a supplement of copper for suckled calves

Published online by Cambridge University Press:  27 March 2009

D. I. Givens ,
G. Zervas ,
V. R. Simpson  and
S. B. Telfer
D. I. Givens
Affiliation:
Agricultural Development and Advisory Service, Nutrition Chemistry Department, Starcross, Exeter, Devon
G. Zervas
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds
V. R. Simpson
Affiliation:
Agricultural Development and Advisory Service Veterinary Investigation Centre, Polwhele, Truro, Cornwall
S. B. Telfer
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds
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Summary

An experiment was carried out on a site where the copper content of herbage was relatively low (4·7–6·2 mg/kg d.m.) to examine the value of copper contained in soluble glass rumen boluses as a means of providing supplementary copper to calves.

Forty-five spring-born suckled calves (mean live weight 91 kg) were divided into three groups on the basis of body weight. Animals in group GB were given two boluses initially, those in group CI each received copper injections at approximately monthly intervals and those in group C remained as controls throughout. Group C calves became progressively hypocupraemic (minimum mean plasma copper 8·5 μmol/1) compared with those in groups GB and CI which showed an increase in plasma copper concentration. In addition measurements of plasma caeruloplasmin activity, blood haemoglobin concentration and erythrocyte superoxide dismutase activity all showed significant increases due to treatment. No response in live-weight gain was observed but overall live-weight gain was approximately 1·05 kg/day. Although the initial response in plasma copper was quicker with copper injections, measurements of erythrocyte superoxide dismutase activity and haemoglobin showed advantages of glass boluses not shared by copper injections. This possibly resulted from the slow release nature of copper in the glass. Under the conditions of the experiment where herbage molybdenum values were relatively low (1·2–1·9 mg/kg d.m.), copper contained in soluble glass boluses appeared to prevent hypocupraemia in calves as effectively as regular copper injections.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 110 , Issue 1 , February 1988 , pp. 199 - 204
Copyright
Copyright © Cambridge University Press 1988

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