PSIX-15 The Influence of Trace Mineral Source on Reproductive Performance in Recipient Multiparous Beef Cows

Abstract Fifty cow-calf pairs were used to investigate the influence of trace mineral (TM) source on reproductive performance following embryo transfer. Cows blocked by BW and breed sorted into pens containing 5 pairs. Each group was randomly assigned one treatments: 1) Organic TM (OTM): 75 mg Cu from proteinate, 8 Co 105 Mn 3 Se Sel-Plex, 220 Zn animal-1∙d-1; 2) Inorganic (ITM): 255 sulfate, 2.6 carbonate, 1018 sodium selenate, 763 animal-1∙d-1. All cows fed a roughage-based diet with no supplemental Cu, Co, Mn, Se, or Zn. individually 0.9 kg appropriate supplement pellets daily deliver treatments for 89-d, starting 5-d after estrous synchronization. Estrous synchronized in all d 0 experiment received embryos 8-d expressing estrous. Serum plasma obtained every 28-d analyzed hormones TM, respectively. Data as randomized block design R (version 4.0.5). Reproductive hormone concentrations similar across treatments. receiving OTM had greater (P < 0.05) when compared ITM. There treatment x time interaction 0.03). Copper decreased over ITM supplemented increased cows. These data suggest that did not impact but improve status 94-d experiment.