Abstract

Angus and Angus-cross calves (632 lb) were utilized in a finishing study to evaluate the effects of implanting with estradiol and progesterone (Synovex-S®) and(or) trenbolone acetate (Finaplix®) on performance of finishing steers. Over the entire finishing period (117 d), implanted steers had higher (P<.05) daily gains and were more efficient than nonimplanted steers. Carcasses from implanted cattle had heavier (P<.05) hot weights and larger (P<.05) ribeye areas. Steers implanted with Finaplix had larger (P<.05) ribeye areas than those implanted with Synovex only. Marbling scores and quality grades were not affected by implant treatments. Rib (9-10-11) sections from implanted steers were heavier (P<.05) as a result of both heavier (P<.05) bone and soft tissue weights. However, no differences in percentages of protein, fat, and moisture were detected by proximate analysis of the soft tissue. Concomitant use of Finaplix with Synovex-S did not affect performance of Angus and Anguscrossed steer calves.

Keywords: Cattlemen's Day, 1991, Kansas Agricultural Experiment Station contribution, no. 91-355-S, Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service), 623, Beef, Trenbolone acetate, Performance, Carcass traits, Chemical composition

How to Cite:

Huck, G. L., Brandt, R. T., Jr., Simms, D., Kuhl, G. L. & Dikeman, M. E., (1991) “Timing of trenbolone acetate implants on performance, carcass characteristics, and beef quality of finishing steer calves”, Kansas Agricultural Experiment Station Research Reports 1(1), 90-92. doi: https://doi.org/10.4148/2378-5977.2226