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The Effects of Four Implant Treatments and Two Feeding Systems on Carcass and Palatability Characteristics of Young Bulls¹

The Ohio State University, Columbus 43210-1095

Abstract

Sixty-four Angus bulls were allotted at 8 mo to four implant treatments: non-implant (N), 36 mg zeranol (Z) at d 1 and 112, 24 mg estradiol-17ß (E) at d 1 and a combination of both implants (EZ) and to two energy management systems: a constant (C) energy (shelled corn plus corn silage) throughout the trial and a two-phase (2P) feeding system (corn silage to d 112 followed by a whole com diet). Bulls were slaughtered as a lot when a 13th rib fat thickness of 7.6 mm was detected by sonaray. Carcasses were more (P < .01) youthful and fatter, providing less (P < .05) edible portion, with a smaller (P < .05) and more (P < .01) finely textured longissimus muscle under C than under 2P. Subcutaneous fat thickness was greatest (P < .05) for EZ and least (P < .05) for Z. Brighter (P < .01) lean color occurred with E. Edible portion of the four thick primal cuts was greatest (P < .05) with Z. Energy x implant interactions (P < .05) were detected for marbling, quality grade, and taste panel tenderness and juiciness. All combinations resulted in mean marbling scores of small except for 2 P x EZ and 2 P x Z groups, with slight marbling. The 2P x Z had the lowest grade, low Select (P < .05). Tenderness was improved (P < .05) regardless of implant compared to N for the 2P system. Longissimus steaks from C x Z and 2P x EZ combinations were juiciest (P < .05). The ideal system for producing high-yielding, palatable, high Select beef from young bulls was the 2P feeding system with implant use.

¹ Salaries and research support provided by State and Federal funds appropriated to the Ohio Agric. Res. and Dev. Center, The Ohio State Univ., Dept. of Anim. Sci., Journal Article 145-88.

² Dept. of Anim. Sci., Purdue Univ.

³ Deceased.

⁴ To whom reprints requests should be addressed.