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This study aimed to assess how the timing of injectable trace mineral administration affects the health and performance of beef calves during weaning.

May 13, 2026Open Access

Effects of Timing of Injectable Trace Mineral Administration on Beef Calf Performance and Health Following Simulated Marketing

Puntos clave

This study aimed to assess how the timing of injectable trace mineral administration affects the health and performance of beef calves during weaning.
115 mixed-sex beef calves weighing approximately 224 kg were randomly divided into three treatment groups: no ITM, 28 days prior to weaning, or at weaning.
Calves were transported to an auction barn post-weaning, with data collected on body weight, blood, and hair samples throughout the receiving period.
Statistical analysis of mineral levels was performed using SAS 9.4.
Serum selenium levels increased significantly in calves receiving ITM 28 days prior to weaning (p < 0.01).
Serum manganese showed significant increases in both the prior to weaning and at weaning groups (p < 0.01).
Despite improved mineral status, no performance benefits were noted during the receiving period due to adequate baseline mineral status.

Resumen

The objective of this study was to evaluate the effects of timing of injectable trace mineral (ITM) administration (28 days (d) prior to or at weaning) on performance and health in mixed-sex beef calves (n = 115; 224 ± 40 kg). Calves were randomly assigned to one of the following treatments: (1) no ITM (CON), (2) ITM administered 28 d before weaning (PW), or (3) ITM administration at weaning (WEAN). At weaning, calves were transported to a local auction barn, held overnight, and returned the following day; BW, blood, and hair samples were collected prior to and through the receiving period. Data were analyzed using SAS 9.4. Serum Se increased in PW calves following ITM administration (p < 0.01). Serum Mn increased in PW and WEAN groups (p < 0.01) and PW calves showed increased serum Cu at weaning (p < 0.01). Across treatments, calves experienced 6% shrink following weaning and transport, with recovery of BW and intake occurring within 21 d and 8 d, respectively. Despite improved mineral status, no performance benefits were observed during the receiving period, reflecting adequate baseline mineral status and low-stress management conditions, suggesting that ITMs may have limited benefits in well-managed herds.

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