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The effect of various levels of dietary copper and molybdenum on copper and molybdenum metabolism in sheep



The effect of various levels of dietary copper and molybdenum on copper and molybdenum metabolism in sheep



South African Journal of Animal Science 10(1): 37-48



A trial was conducted in which the rations of sheep were supplemented with different levels of Cu and Mo. The S intake was kept constant at 2.1 g/sheep per day. Two levels of Mo were fed; 38 mg/sheep per day for 92 days or 21 mg/sheep per day for 182 days. Each Mo group was subdivided into 3 Cu treatments; 24, 40 and 68 mg Cu/sheep per day. No difference in Cu accumulation in the livers was observed between the different levels of dietary Mo. A linear increase in hepatic Cu content was recorded, depending on total Cu intake and independent of duration of Cu feeding. Between 1.18-1.97% of the Cu taken in, was retained in the livers. Indications of the existence of interactions between Cu and Fe and between Cu and Zn were obtained from Fe and Zn concentrations in the livers. Although total Mo intakes during the experimental periods were approximately the same, Mo concentrations in the livers, kidney cortices and plasma were significantly higher (P < 0.01) at a Mo intake of 38 mg/sheep per day than at 21 mg Mo/day. Mo concentrations in these body tissues are of a fairly transient nature, being related at a constant S intake not to total intake of Mo but to the daily amount of Mo consumed.

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Accession: 001006780

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