Study questions benefit of ITM timing in beef calves at weaning

A new study in Animals examined whether the timing of injectable trace mineral (ITM) administration changes health or performance outcomes for beef calves going through weaning and a simulated marketing event. In the trial, 114 mixed-sex calves were assigned to no ITM, ITM 28 days before weaning, or ITM at weaning. Calves were vaccinated, transported to a local auction market, held overnight, and returned the next morning to mimic a common marketing stressor. The researchers found that giving ITM 28 days before weaning increased some serum mineral measures, including selenium, manganese, and copper at specific time points, but timing did not improve body weight, respiratory vaccine titers, haptoglobin, or hair cortisol under the study conditions. The author’s thesis summary concludes that, in these well-managed calves, ITM timing did not affect performance, stress, or health biomarkers after simulated marketing. (scholarworks.uark.edu)

Why it matters: For veterinary professionals working with cow-calf operations, the study adds to a mixed evidence base around strategic injectable mineral use at weaning. The practical takeaway is that measurable shifts in mineral status don’t necessarily translate into better short-term growth or health outcomes when calves are already well managed and mineral status may not be limiting. That aligns with other recent and prior research showing ITM can improve copper and selenium status, and in some settings immune or antioxidant responses, while performance effects remain inconsistent and appear to depend on stress level, breed, and baseline nutrition. (scholarworks.uark.edu)

What to watch: More work is likely to focus on whether ITM timing matters more in higher-risk, nutritionally marginal, or more heavily stressed calves than it did in this relatively controlled study. (academic.oup.com)