Experimental copper and chromium deficiency and additional molybdenum supplementation in goats I. Feed consumption and weight development

Secondary Cu deficiency, Cr deficiency and molybdenosis were suggested causes of the ‘mysterious’ disease afflicting moose Alces alces L.. in a region in south-west Sweden affected by acid rain. A model experiment with goats was performed to study the clinical chemical parameters, determine the tissue contents of trace and minor elements, to perform pathological and histopathological investigations and to compare the findings with those in moose disease. Twenty 3-month-old male goats were assigned to four dietary treatments five animals each. in an experiment lasting for 20 months. The four groups in the study were: control group, Cu-deficient group group 1., Cr-deficient group group 2., and Cu- and Cr-deficient group group 3.. The animals were fed a basic semi-synthetic diet. At the end of the study the three surviving animals of group 3 were supplemented with additional tetrathiomoly- bdate TTM. during the last 2 months. Feed consumption and weight development of the animals were monitored and are presented. The feed consumption of the two Cu-deficient groups of goats group 1 and group 3. supported the previously described observations in copper deficiency in ruminants, e.g. decreased appetite and feed intake. A previously unreported effect of Cr deficiency in ruminants is now described in goats. Chromium deficiency at adequate Cu supplementation group 2., caused increased lipid synthesis and a weight gain of 32 kg compared with that of the control group 20 kg.. A possible explanation for this unexpected weight increase in only Cr deficiency is discussed. It is concluded that the feeding experiment does not support the hypothesis concerning the relation of Cr deficiency to the moose disease.