Interpretive Summary: Effects of injectable vitamin E before or after transit on receiving phase growth performance, health, and blood parameters of beef steers

By: Colten W Dornbach, Aubree M Beenken-Bobb, Daniel W Shike, Stephanie L Hansen, Joshua C McCann

Cattle are transported multiple times throughout their lifespan due to the geographic distribution of the United States beef industry. However, transportation can elicit a variety of stressors that jeopardize cattle growth performance and health. Lightweight feeder calves are at the greatest risk for stress-related morbidity and mortality during the feedlot receiving phase. This study evaluated the effects of injectable vitamin E (VE) before or after transit on feedlot receiving phase growth performance, health, and blood parameters of lightweight beef steers. Steers receiving an injection of VE before or after transit had increased serum α-tocopherol concentrations. However, treatment with VE did not improve growth performance and feed intake. Steers injected with VE before or after transit experienced a decrease in hair cortisol concentrations 14 d after transit while steers injected with VE after transit had improved antioxidant status 14 d after transit compared with control steers and those receiving VE before transit. These results indicate that an injection of VE around the time of transit had no effect on growth performance and intake but can improve antioxidant status during the receiving phase.