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Effects of trenbolone acetate on carcass characteristics and serum testosterone and cortisol concentrations in bulls and steers on different management and implant schemes.
J Anim Sci 1991; 69(4):1363-9JA

Abstract

The objective of this study was to determine the effects of different implanting schemes on serum testosterone and cortisol concentrations, and carcass traits of bulls and steers implanted with trenbolone acetate (TBA) and zeranol (Z). Twenty Polled Hereford bulls were randomly assigned to one of three treatments after birth. Five calves served as nonimplanted control bulls (NIB). Nine bulls were implanted (IB) with 140 mg of TBA and 36 mg of Z at about 1 mo of age and reimplanted with both compounds 10 wk later. When IB calves were about 21 wk of age, the TBA implant was removed and calves were reimplanted with Z every 10 wk until slaughter. Six calves were castrated at 3 wk of age and implanted (IS) with TBA and Z every 10 wk until slaughter. Blood samples from each animal were obtained at 14-d intervals beginning at 14 wk of age and serum cortisol (C) and testosterone (T) concentrations were determined. The NIB had higher C levels than IB or IS (P less than .05) during the preweaning period. During the finishing period, there were no differences in C concentrations between NIB and IB; however, IS had lower levels (P less than .05) than both bull treatments. Serum T concentrations began to increase about 12 wk later (42 vs 30 wk, respectively) in IB compared with NIB. Testicular size was smaller (P less than .05) in IB than in NIB. No differences (P greater than .05) were observed in carcass characteristics. Taste-panel scores were not different among treatments. In conclusion, implanting schemes using TBA and Z lowered serum levels of C and delayed puberty in bulls; however, they did not alter carcass characteristics or eating quality.

Authors+Show Affiliations

Dept. of Anim. Sci., University of Nebraska, Lincoln 68583-0908.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

2071500

Citation

Jones, S J., et al. "Effects of Trenbolone Acetate On Carcass Characteristics and Serum Testosterone and Cortisol Concentrations in Bulls and Steers On Different Management and Implant Schemes." Journal of Animal Science, vol. 69, no. 4, 1991, pp. 1363-9.
Jones SJ, Johnson RD, Calkins CR, et al. Effects of trenbolone acetate on carcass characteristics and serum testosterone and cortisol concentrations in bulls and steers on different management and implant schemes. J Anim Sci. 1991;69(4):1363-9.
Jones, S. J., Johnson, R. D., Calkins, C. R., & Dikeman, M. E. (1991). Effects of trenbolone acetate on carcass characteristics and serum testosterone and cortisol concentrations in bulls and steers on different management and implant schemes. Journal of Animal Science, 69(4), pp. 1363-9.
Jones SJ, et al. Effects of Trenbolone Acetate On Carcass Characteristics and Serum Testosterone and Cortisol Concentrations in Bulls and Steers On Different Management and Implant Schemes. J Anim Sci. 1991;69(4):1363-9. PubMed PMID: 2071500.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of trenbolone acetate on carcass characteristics and serum testosterone and cortisol concentrations in bulls and steers on different management and implant schemes. AU - Jones,S J, AU - Johnson,R D, AU - Calkins,C R, AU - Dikeman,M E, PY - 1991/4/1/pubmed PY - 1991/4/1/medline PY - 1991/4/1/entrez SP - 1363 EP - 9 JF - Journal of animal science JO - J. Anim. Sci. VL - 69 IS - 4 N2 - The objective of this study was to determine the effects of different implanting schemes on serum testosterone and cortisol concentrations, and carcass traits of bulls and steers implanted with trenbolone acetate (TBA) and zeranol (Z). Twenty Polled Hereford bulls were randomly assigned to one of three treatments after birth. Five calves served as nonimplanted control bulls (NIB). Nine bulls were implanted (IB) with 140 mg of TBA and 36 mg of Z at about 1 mo of age and reimplanted with both compounds 10 wk later. When IB calves were about 21 wk of age, the TBA implant was removed and calves were reimplanted with Z every 10 wk until slaughter. Six calves were castrated at 3 wk of age and implanted (IS) with TBA and Z every 10 wk until slaughter. Blood samples from each animal were obtained at 14-d intervals beginning at 14 wk of age and serum cortisol (C) and testosterone (T) concentrations were determined. The NIB had higher C levels than IB or IS (P less than .05) during the preweaning period. During the finishing period, there were no differences in C concentrations between NIB and IB; however, IS had lower levels (P less than .05) than both bull treatments. Serum T concentrations began to increase about 12 wk later (42 vs 30 wk, respectively) in IB compared with NIB. Testicular size was smaller (P less than .05) in IB than in NIB. No differences (P greater than .05) were observed in carcass characteristics. Taste-panel scores were not different among treatments. In conclusion, implanting schemes using TBA and Z lowered serum levels of C and delayed puberty in bulls; however, they did not alter carcass characteristics or eating quality. SN - 0021-8812 UR - https://www.unboundmedicine.com/medline/citation/2071500/Effects_of_trenbolone_acetate_on_carcass_characteristics_and_serum_testosterone_and_cortisol_concentrations_in_bulls_and_steers_on_different_management_and_implant_schemes_ L2 - https://academic.oup.com/jas/article-lookup/doi/10.2527/1991.6941363x DB - PRIME DP - Unbound Medicine ER -