(1) Two trials on the effect of copper glycine injections on the live-weight gains of suckling beef calves under commercial conditions are described. (2) One injection supplying 120 mg. of copper increased live-weight gains by approximately 10% during the suckling and grazing period. A second injection given two months after the first gave a further positive but not statistically significant response.
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Morgan et al. (1962) studied this question.
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