Dietary starch concentration alters copper metabolism in lactating Holstein-Friesian dairy cows receiving added dietary sulfur and molybdenum. McCaughernCopper is a trace element that is essential for dairy cow health and performance. The absorption of copper has been shown to vary according to a variety of dietary factors, although the mechanisms are not well understood. The current study found that higher dietary starch concentrations that resulted in a lower rumen pH increased copper absorption. This information allows dairy farmers to more accurately provide the correct amount of dietary copper. DIETARY STARCH INFLUENCES COPPER METABOLISMDietary starch concentration alters reticular pH, hepatic copper concentration, and performance in lactating Holstein-Friesian dairy cows receiving added dietary sulfur and molybdenum

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