Supplementation of chromium, as chromium yeast, in a free choice mineral reduced the interval from calving to first estrus and tended to improve pregnancy rate in young Zebu cows in Brazil (Aragon et al., 2001). Body weight gain was also greater in cows supplemented with chromium from parturition until their calves were weaned. At the present time chromium is not permitted in free choice mineral supplements. In the future chromium may be cleared for use in trace mineral salt and other free choice mineral supplements