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Copper Distribution in Milk during Early Lactation¹

Department of Dairy Science, University of Maryland, College Park

ABSTRACT

Cu⁶⁴ was used to determine the distribution of natural copper in milk at intervals during early lactation. The amount of copper associated with fat globules was about 15% after 2 and 4 wk of lactation and 35% after 10 wk. The change in copper distribution was accompanied by a change in susceptibility to oxidized flavor. A combination of cream washing and chelation by EDTA removed up to 90% of lipid-bound copper. When these treated fat globules were added back to and recovered from the original skimmilk, their copper content increased. Administration of Cu⁶⁴ by infusion or by drench yielded similar results with respect to distribution, but rate of appearance in milk was slower by drenching.

¹ Scientific Article No. A1008. Contribution No. 3396 of the Maryland Agricultural Experiment Station, Department of Dairy Science.