EurekaMag
+ Most Popular
Cunninghamia lanceolata plantations in China
Mammalian lairs in paleo ecological studies and palynology
Studies on technological possibilities in utilization of anhydrous milk fat for production of recombined butter-like products
Should right-sided fibroelastomas be operated upon?
Large esophageal lipoma
Apoptosis in the mammalian thymus during normal histogenesis and under various in vitro and in vivo experimental conditions
Poissons characoides nouveaux ou non signales de l'Ilha do Bananal, Bresil
Desensitizing efficacy of Colgate Sensitive Maximum Strength and Fresh Mint Sensodyne dentifrices
Administration of fluid by subcutaneous infusion: revival of a forgotten method
Tundra mosquito control - an impossible dream?
Schizophrenia for primary care providers: how to contribute to the care of a vulnerable patient population
Geochemical pattern analysis; method of describing the Southeastern limestone regional aquifer system
Incidence of low birth weights in a hospital of Mexico City
Tabanidae
Graded management intensity of grassland systems for enhancing floristic diversity
Microbiology and biochemistry of cheese and fermented milk
The ember tetra: a new pygmy characid tetra from the Rio das Mortes, Brazil, Hyphessobrycon amandae sp. n. (Pisces, Characoidei)
Risk factors of contrast-induced nephropathy in patients after coronary artery intervention
Renovation of onsite domestic wastewater in a poorly drained soil
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Systolic blood pressure in a population of infants in the first year of life: the Brompton study
Haematological studies in rats fed with metanil yellow
Studies on pasteurellosis. I. A new species of Pasteurella encountered in chronic fowl cholera
Dormancy breaking and germination of Acacia salicina Lindl. seeds
therapy of lupus nephritis. a two-year prospective study

Effects of estradiol benzoate and trenbolone acetate, alone or in combination at dose levels present in Synovex Choice, on performance by feedlot heifers


Effects of estradiol benzoate and trenbolone acetate, alone or in combination at dose levels present in Synovex Choice, on performance by feedlot heifers



Journal of Animal Science 91(2): 970-977



ISSN/ISBN: 0021-8812

PMID: 23307845

DOI: 10.2527/jas.2012-5214

Trials were conducted with beef heifers at 4 sites to evaluate feedlot performance and carcass characteristics in response to implants containing 14 mg estradiol benzoate and 100 mg trenbolone acetate (EB/TBA; Synovex Choice, Zoetis LLC, New York, NY), 14 mg estradiol benzoate (EB), 100 mg trenbolone acetate (TBA), or a sham-implanted control (SC). The study design at each site was a randomized complete block with 12 blocks and 4 treatments. Blocks of cattle at each site were harvested in commercial abattoirs when masked personnel estimated at least 60% of animals would yield carcasses with USDA quality grades of Choice or Prime. Data were pooled across sites for statistical analysis. Initial BW averaged 374 kg, and days on feed ranged from 98 to 126 d (mean 112 d). Heifers implanted with EB/TBA, EB, and TBA had greater ADG and G:F (P < 0.05) than SC; ADG and G:F were greater for EB/TBA than EB or TBA (P < 0.05). Heifers treated with TBA had greater G:F than EB (P < 0.05). Feed intake was not affected by treatments. Mean HCW and LM area for EB/TBA were greater than for other treatments (P < 0.05). Mean HCW for TBA was greater than SC (P < 0.05) but not different from EB. Mean LM area for EB and TBA were greater than SC (P < 0.05) but not different from each other. There were no treatment differences (P > 0.05) for KPH, 12th-rib fat thickness, or yield grade. Dressing percent was greater for EB/TBA than SC (P < 0.05) but not different from EB or TBA. Marbling score was decreased by EB/TBA (P < 0.05) compared with other treatments, but no other differences were noted. Despite the effect of EB/TBA on marbling scores, there were no significant (P > 0.05) treatment differences on proportions of carcasses with quality grades ≥ Choice vs. < Choice. With respect to ADG and G:F, implants containing EB, TBA, or EB/TBA produced improved responses over SC. Furthermore, EB/TBA induced greater ADG and G:F responses than EB and TBA. confirmed that EB and TBA have additive effects, as evidenced by the observation that calves implanted with EB/TBA had significantly greater ADG and G:F than heifers implanted with either EB or TBA alone or compared with SC heifers.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 036801797

Download citation: RISBibTeXText

Related references

Effects of estradiol benzoate and trenbolone acetate, alone or combined, on performance by feedlot heifers A multi-site study. Journal of Animal Science 77(Suppl 1): 239-240, 1999

Effects of trenbolone acetate with or without estradiol, synovex H, and Ralgro on the rate and efficiency of gain by feedlot heifers. Animal Science Research Report, Agricultural Experiment Station, Oklahoma State University (MP-119): 340-343, 1987

Production responses in feedlot steers and heifers to an estradiol benzoate/trenbolone acetate implant. Journal of Animal Science 73(Suppl 1): 320, 1995

Dose response relationship of trenbolone acetate estradiol combinations in feedlot heifers. Journal of Animal Science 67(Suppl 2): 109, 1989

Effects of ractopamine and trenbolone acetate implants with or without estradiol on growth performance, carcass characteristics, adipogenic enzyme activity, and blood metabolites in feedlot steers and heifers. Journal of Animal Science 88(12): 4102-4119, 2010

Effect of trenbolone acetate and estradiol benzoate progesterone on feedlot performance and carcass characteristics of growing finishing steers. Journal of Animal Science 67(Suppl 2): 144, 1989

Serum concentrations of trenbolone-17β and estradiol-17β and performance of Heifers treated with trenbolone acetate, melengestrol acetate, or estradiol-17β1,2. Swine Nutrition: Nutrient Usage during Pregnancy and Early Postnatal Growth. Symposium 75(10): 2627-2633, 1997

Serum concentrations of trenbolone-17b and estradiol-17b and performance of heifers treated with trenbolone acetate, melengestrol acetate, or estradiol-17b. Journal of Animal Science 75: 27-33, 1997

Effects of Time of Administration of an Implant Containing 200 Mg of Trenbolone Acetate and 20 Mg of Estradiol in Finishing Heifers Given 80 Mg of Trenbolone Acetate and 8 Mg of Estradiol at Initial Processing and Fed for 181 Days. Journal of Animal Science 96: 244-244, 2018

Effects of Time of Administration of an Implant Containing 200 Mg of Trenbolone Acetate and 20 Mg of Estradiol in Finishing Heifers Given 80 Mg of Trenbolone Acetate and 8 Mg of Estradiol at Initial Processing and Fed for 181 Days. Journal of Animal Science 96: 244, 2018

Serum concentrations of trenbolone acetate and estradiol benzoate in cattle implanted with coated SYNOVEX Plus long-acting implants. Journal of Dairy Science 84(Suppl 1): 273-274, 2001

Trenbolone acetate in combination with 17b-estradiol: influence of implant supports and dose levels on animal performance and plasma metabolites. Journal of Animal Science 66: 12-22, 1988

Evaluation of various implant programs of synovex s finaplix s and estradiol 17 beta trenbolone acetate in feedlot steers of three distinct breed types. Journal of Animal Science 70(Suppl 1): 280, 1992

Trenbolone acetate in combination with 17 beta-estradiol: influence of implant supports and dose levels on animal performance and plasma metabolites. Journal of Animal Science 66(5): 1212-1222, 1988

A trenbolone acetate/estradiol combination in feedlot simmental bulls: Meat quality and withdrawal time of trenbolone. Acta Veterinaria (Belgrade) 50(2-3): 137-146, 2000