ABSTRACT
Three experiments evaluated aggressive implant strategies to better understand implant
duration and allow for maximum return on implant investment in feedlot steers. Crossbred
steers (n = 1,350; 282 kg initial BW, SD = 8) were fed for an average of 215 d (Exp.
1). Treatments were Revalor-IS (80 mg of trenbolone acetate and 16 mg of estradiol)
or Revalor-XS (200 mg of trenbolone acetate and 40 mg of estradiol) initially followed
by 1 or 2 consecutive Revalor-200 (200 mg of trenbolone acetate and 20 mg of estradiol)
implants (6 replications). Crossbred steers (n = 1,513; 265 kg initial BW, SD = 18)
were fed for an average of 208 d (Exp. 2). Treatments were (1) Revalor-G (40 mg of
trenbolone acetate and 8 mg of estradiol) on d 0, Revalor-IS on d 50, and Revalor-200
on d 140; (2) Ralgro (36 mg of zeranol) on d 0 and Revalor-XS on d 50; and (3) Revalor-XS
on d 0 and Revalor-200 on d 140 (5 replications). Holstein steers (n = 1,832; 144
kg initial BW, SD = 11) were fed for an average of 360 d (Exp. 3). Treatments were
(1) Ralgro on d 0, Revalor-IS on d 120, and Revalor-S on d 240; (2) Ralgro on d 0
and Revalor-XS on d 120; (3) Ralgro on d 0, Revalor-IS on d 60, and Revalor-XS on
d 160; and (4) Revalor-XS on d 0 and Revalor-XS on d 160 (6 replications). In all
3 experiments, final BW, ADG, and HCW were not affected by treatment (P ≥ 0.12). Increasingly aggressive implant protocols have limited effects on feedlot
and carcass performance of beef and Holstein steers.
Key words
To read this article in full you will need to make a payment
Purchase one-time access:
Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online accessOne-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:
Subscribe toAlready a print subscriber? Claim online access
Already an online subscriber? Sign in
Register: Create an account
Institutional Access: Sign in to ScienceDirect
LITERATURE CITED
- Effects of synthetic hormone implants, singularly or in combinations, on performance, carcass traits, and longissimus muscle palatability of Holstein steers.1752819J. Anim. Sci. 1991; 69: 4437-4448
- Factors affecting release rates and blood levels of hormones from steroidal implants.in: Pages 34–39 Proc. Symp. Impact Implant Perf. Carcass Value Beef Cattle Oklahoma State Univ., Stillwater, OK1997
- The effect of stage of growth and implant exposure on performance and carcass composition in steers.15583049J. Anim. Sci. 2005; 83: 108-116
- Meat science and muscle biology symposium—Anabolic implants and meat quality.24243897J. Anim. Sci. 2014; 92: 3-9
- Guide for the Care and Use of Agricultural Animals in Agricultural Research and Teaching.3rd rev. FASS Inc., Champaign, IL2010
- Evaluation of Revalor-IH and Revalor-IS as initial implants compared with traditional initial implants for finishing heifers and steers.Prof. Anim. Sci. 2009; 25: 580-585
- The effects of implant strategy on finished body weight of beef cattle.12162646J. Anim. Sci. 2002; 80: 1791-1800
- Effect of increasing initial implant dosage on feedlot performance and carcass characteristics of long-fed steer and heifer calves.Prof. Anim. Sci. 2016; 32: 53-62
- Application of growth technologies in enhancing food security and sustainability.Anim. Front. 2013; 3: 8-13
- Effect of sequential implanting with Synovex on steer and heifer performance.8056653J. Anim. Sci. 1994; 72: 1095-1100
- Biochemistry and physiology of anabolic hormones used for improvement of meat production.11297191APMIS. 2001; 109: 1-8
- Optimizing carcass value and the use of anabolic implants in beef cattle.J. Anim. Sci. 2002; 79: E296-E306
- Comparison of Revalor XS a new single-dose implant, to a Revalor IS and Revalor S implant strategy in finishing steers.Prof. Anim. Sci. 2014; 30: 51-55
- Dose and release pattern of anabolic implants affects growth of finishing beef steers across days on feed.21097688J. Anim. Sci. 2011; 89: 863-873
- Effect of an implant of trenbolone acetate and estradiol on growth, feed efficiency, and carcass composition of Holstein and beef steers.1808166J. Anim. Sci. 1991; 69: 4696-4702
- Hormone containing growth-promotant implants: Managing the tools.Vet Clinic. Food Anim. Pract. 1999; 23: 309-319
- Effect of implant strategies on feedlot performance and carcass traits of steers.in: Pages 57–61 and Paper 17 in South Dakota State Beef Report, 1994 South Dakota State Univ., Brookings1994
- Growth-promotant implants: Managing the tools.17606153Vet. Clin. North Am. Food Anim. Pract. 2007; 23: 309-319
- Implant strategies during feeding: Impact on carcass grades and consumer acceptability.10907829J. Anim. Sci. 2000; 78: 1867-1874
- Implant program effects on performance and carcass quality of steer calves finished for 212 days.8818790J. Anim. Sci. 1996; 74: 1470-1476
- Effect of repeated administration of combination trenbolone acetate and estradiol implants on growth, carcass traits, and beef quality of long-fed Holstein steers.14552364J. Anim. Sci. 2003; 81: 2395-2400
- Official United States Standards for Grades of Carcass Beef. Agric. Market. Serv.USDA, Washington, DC1997
Article info
Publication history
Accepted:
May 3,
2018
Received:
November 1,
2017
Footnotes
Two of the authors work for Merck Animal Health, De Soto, Kansas, which provided funding and products. The other authors declare no conflict of interest.
Identification
Copyright
Copyright © 2018, American Registry of Professional Animal Scientists. All rights reserved.
