The primary role of Cr appears to relate to its ability to enhance the action of insulin. Requirements for Cr in dairy cattle have not been defined However, stud- ies have indicated that Cr supplementation may affect health and immune response in stressed calves Several other reports also indicate that Cr supple- mentation can significantly affect feed intake and milk pro- duction in early lactation dairy cows In these studies Cr was supplemented from 21 to 28 days pre-par- tum until 28 to 35 days post-partum.