Effect of a trace mineral injection at weaning on growth, antioxidant enzymes activity, and immune system in Nellore calves.

The objective of this study was to evaluate the effects of injectable trace minerals (ITM) at the time of weaning on growth, antioxidant, and immune response of Nellore (Bos indicus) calves. Weaned calves (n = 159; 213 ± 32 kg) were stratified by body weight (BW) and randomly assigned to 1 of 2 treatments: injection (1 mL/45 kg of BW) of saline or ITM. Saline solution consisted of 0.