The changes that occur in a prepartum dairy cow fed a negative DCAD dry cow diet with AniStart include three changes to calcium metabolism of the cow that increases prepartum calcium flux. First, (and in no particular order) is the increase in dietary calcium absorption. Second, is the initiation of bone resorption. And finally, is the increased excretion of calcium by the kidney through urine. These three coordinated actions act to increase the movement of calcium (calcium flux) through the exchangeable calcium pool, making more calcium available to the cow during the critical period of colostrogenesis and early lactation. Watch the video for more detailed explanations: