A study conducted on forty four triple cross-bred (� Kankrej X � Jersey X � Holstein Friesian) pregnant heifers (20) and cows (24) on days 90,150, 210 and 275 of gestation for various serum mineral parameters, revealed serum minerals calcium and phosphorus were significantly (P<0.01) decreased from day 90 to day 275 of gestation and serum Ca : P ratio significantly (P<0.01) rose from day 90 to day 275 of gestation. Overall combined value for serum sodium and potassium were significantly (P<0.05) higher at day 275 as compare to day 90 of gestation. 1340703256.php