Technical Note: Feeding Zilpaterol Hydrochloride to Calf-Fed Holstein Steers Improves Muscle Conformation of Top Loin Steaks

Abstract The objective of this research was to evaluate changes in the muscle conformation of subprimal top-loins ( M. longissimus lumborum ) from calf-fed Holstein steers fed zilpaterol hydrochloride (ZH). Top-loins (n = 100) were transversely cut into 2.54 cm-thick steaks, weighed, and objectively evaluated via image analysis software for muscle area, width, and length traits. Top-loin steaks from steers fed ZH were heavier ( P P 2 ) as compared to steaks from control steers. Muscle width (medial–lateral) was not different ( P  = 0.23) between control steers and those fed ZH. However, steaks from steers fed ZH had greater ( P