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.
Highlights
Substantial liveweight gain responses have been reported from implanting anabolic agents in finishing beef steers
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
Steers implanted with Finaplix had larger (P
Summary
Substantial liveweight gain responses have been reported from implanting anabolic agents in finishing beef steers. Finaplix® (F), an implant containing trenbolone acetate, an anabolic androgenic steroid, has been shown to increase muscle to bone ratio and ribeye area and decrease both subcutaneous and intramuscular fat. Research at other universities has shown that Finaplix may reduce quality grade by 8 to 10%. Whether implanting Finaplix early in the finishing period will lessen this reduction in grade is not clear. Nor do we know the effect on carcass characteristics of implanting early with F followed by a subsequent F implant midway through the finishing period. Our objectives were to determine the effects of 1) implanting F early and late in the finishing period and 2) implanting F one or two times on animal performance, carcass traits, and beef palatability estimates
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