The present study was carried out at the Livestock Research Complex, SRS, NDRI, District Bengaluru, India. Twelve indigenous Deoni heifers in their last month of gestation period were selected based on their dam’s lactation yield and lactation length. The cows were randomly divided into two groups of six each. | Effect of supplementation of trace minerals and vitamins during transition phase on lactation performance of deoni primiparous heifers