Analysis of data collected in a residue survey: copper and zinc concentrations in liver, kidney and muscle in Australian sheep and cattle
1987
Langlands, J.P. | Donald, G.E. | Smith, A.J. (Commonwealth Scientific and Industrial Research Organization, Armidale (Australia). Div. of Animal Production)
Samples were collected between 1975 and 1983 from 2797 sheep or cattle at 39 meatworks located in all Australian States and the Northern Territory. Hepatic Cu concentrations tended to be postively skewed with a long tail of observations with high concentrations. About 3 percent of ovine livers and 9 percent of bovine livers contained less than 2 mg Cu per kg freshweight when calculated on a national basis. This concentration was arbitrarily taken as the criterion of a low Cu status, and the proportion within States falling into this class ranged from about 1 percent in sheep from Queensland, Western Australia and Tasmania to about 11 percent in Victoria. Proportions in cattle were highest in Victoria, Queensland and New South Wales, and were 13.6, 10.5 and 8.9 percent respectively. Correlations between Cu and Zn concentrations in the different tissues were low. Possible sources of bias in applying the results to predicting the number of Cu-deficient animals in the various States are discussed.
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