The shift to defining mineral absorption coefficients (AC) by feed class and type of mineral supplement was a step forward in the 2001 Dairy NRC.[2] Previous NRC publications had assigned AC values by mineral rather than feed type. Calcium can be used as an example. The AC in the 1989 Dairy NRC[4] was 0.38 for calcium and did not vary by source. The 2001 Dairy NRC uses an AC of 30% for forages and 60% for concentrate feeds.[2] The AC value also varies from 30% to 95% from different mineral sources. A similar approach is used for other minerals.

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