Preconditioning constitutes management practices that help reduce steers’ transition-related stress from a ranch to a feedlot. Auction-derived (AD) steers, generally exposed to various stressors over a short period, are often commingled with preconditioned (PC) steers in feedlots for homogeneity. The present study examined the physiological and behavioral changes in PC and AD steers when commingled in various proportions during the first 6 wk in the feedlot. Our study found that PC steers exhibited favorable behaviors, spending more time eating, ruminating, and being active compared to AD steers, irrespective of commingling. However, hair cortisol concentrations did not identify steers experiencing lower ranch transfer-related stress, disease, or poor growth performance.

Read the full article in the Journal of Animal Science.