Effects of lubabegron supplementation on live performance, carcass characteristics, and mobility of Holstein steers

Objective

The objectives of this study were to assess the effects of feeding Lubabegron (LB; Experior, Elanco, Greenfield, IN) for 0, 28, 56, or 84 d on live growth, car- cass, and mobility in Holstein steers.

Materials and Methods

Holstein steers (n = 438; 521 kg ± 35.5 kg) were used in a completely randomized study with 4 duration treatments: control, LB for 28 d, LB for 56 d, and LB for 84 d. Feed intake, BW, and car- cass data were all measured and analyzed on an individual basis.

Results and Discussion

In the pooled analysis, steers fed LB had greater total gain, ADG and G:F on a live and yield-adjusted basis relative to the controls. Lubabegron treated cattle had greater hot carcass weight, dressing per- cent and ribeye area, and decreased marbling score and average yield grade compared with the control treatment. There were no differences detected between LB or control steers in mobility at either shipment to abattoir or in lai- rage.

Implications and Application

Supplementation with LB favorably altered growth and carcass responses. Steers fed LB had no differences in mobility or other health maladies during the feeding period. These results indicate that feedyard producers can utilize LB without negatively affecting feeding performance or carcass quality.