Figure 1.

Timeline of two-year trial evaluating the impact of trace mineral injection (TMI) of beef cows on trace mineral concentration in liver (LB) and effects on cow reproduction and calf growth. Injections were given to cows pre-calving (days 0 and 365) and pre-breeding (days 117 and 478), and liver biopsies were taken prior to injection on those dates. Liver samples were also taken 15 to 18 days post pre-breeding TMI (days 132 and 496) and near weaning (days 293 and 632). Cows were estrus synchronized and artificially inseminated (AI), then exposed to fertile bulls. Pregnancy was determined using ultrasonography (days 195 and 567) to determine pregnancy due to AI and by rectal palpation (days 245 and 659) to determine the overall pregnancy rate.