Cited by 294Pharmacological Effects and AssaysMeat and Animal Product QualityRuminant Nutrition and Digestive Physiology

Use of a β-Agonist to Alter Fat and Muscle Deposition in Steers1

Ricks, Catherine A., Dalrymple, R. H., Baker, Pamela K., Ingle, D. L.·1984·Journal of Animal Science

Abstract

The effect of a β-agonist, clenbuterol [benzyl alcohol, 4-amino-α-(t-butylamino)methyl-3, 5-dichloro] on carcass composition, performance criteria and clinical blood chemistry was evaluated in 24 finishing Hereford steers assigned to three treatment groups. Clenbuterol was administered in the feed at 0, 10 or 500 mg•head−1•d−1 for 98 d. Carcass evaluation showed that the 10 and 500 mg•head−1•d−1 treatment groups had 11 (P≤.05) and 16% (P≤.01) larger 12th rib longissimus muscle areas, 35 (P≤.01) and 42% (P≤.01) less 12th rib fat depths, 23 (P≤.05) and 33% (P≤.01) less kidney, pelvic and heart fat and improved USDA yield grades of 1.0 and 1.5 grade points, respectively. Chemical analysis of the 9th to 11th rib section from these carcasses indicated that they had 13 (P≤.01) and 14% (P≤.01) higher protein contents, 20 (P≤.01) and 30% (P≤.01) less fat and 10 (P≤.05) and 16% (P≤.01) more water, respectively. Clinical chemistry measurements were within normal physiological ranges. Blood urea N levels (mg/dl) for the 0, 10 and 500 mg clen-buterol•head−1•d−1 were 9.6, 8.5 and 5.9 (P≤.01), respectively, indicating that clenbuterol may have increased N retention. Rate of gain was not altered at 10 mg•head−1•d−1, but was reduced (P≤.05) by the high drug level. There were no differences among treatments in feed efficiency. The data demonstrate that significant improvements in muscle accretion with concomitant reductions in fat deposition can be achieved by feeding clenbuterol to finishing steers.

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Crossref · 10.2527/jas1984.5951247x

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Authors
Ricks, C. A., Dalrymple, R. H., Baker, P. K., & Ingle, D. L.
Affiliations
Apnimed (United States) (US)
Venue
Journal of Animal Science
Published
1984-11-01
Volume
59
Issue
5
Pages
1247-1255
ISSN
  • 0021-8812 (ISSN-L)
  • 1525-3163
OpenAlex
W2547271346
Cited by
294
References
0
Citations by year
2026: 4 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 5 · 2020: 2 · 2019: 1 · 2018: 8 · 2017: 9 · 2016: 5 · 2015: 5 · 2014: 4 · 2013: 9 · 2012: 4
FWCI
18.79
Type
journal article
Language
en
Open access
closed
Locations
Journal of Animal Science (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Pharmacological Effects and Assays
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Meat and Animal Product Quality
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Ruminant Nutrition and Digestive Physiology
Keywords
clenbuterol, beta-adrenergic agonists, Hereford steers, carcass composition, fat deposition, muscle deposition, loin eye area, USDA yield grade, blood urea nitrogen, nitrogen retention, weight gain, feed efficiency, finishing cattle

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