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Related Experiment Videos

Feedlot medicine and management. Implants

T L Mader1

  • 1Department of Animal Science, University of Nebraska, Concord, USA.

The Veterinary Clinics of North America. Food Animal Practice
|August 15, 1998
PubMed
Summary
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Growth-promoting implants, including estrogenic and androgenic agents, enhance beef cattle performance. Strategic lifetime implant programs optimize gains and feed efficiency while minimizing side effects.

Area of Science:

  • Animal Science
  • Ruminant Nutrition
  • Beef Cattle Production

Background:

  • Growth-promoting implants have a 30-year history in beef production, evolving from estrogenic agents to include androgenic compounds.
  • Early implants (pre-1987) used estrogenic agents to improve nutrient utilization, increasing intake, feed efficiency, and daily gains.
  • The introduction of trenbolone acetate (TBA), an androgenic agent, in 1987 enhanced muscle growth without increasing intake, further improving feed efficiency and daily gains.

Purpose of the Study:

  • To review the evolution and strategic use of growth-promoting implants in beef cattle production.
  • To highlight the importance of implant type, timing, and sequence for lifetime performance.
  • To provide recommendations for designing optimal lifetime implant programs.

Main Methods:

Related Experiment Videos

  • Review of historical and current implant technologies and strategies in beef production.
  • Analysis of the metabolic and physiological effects of estrogenic and androgenic agents.
  • Examination of recent studies on sequential implanting and lifetime gain.

Main Results:

  • Modern implants are often 'designer' products with varied estrogenic and androgenic combinations.
  • Sequential use of increasingly potent implants can maximize lifetime gain (up to 150 lb) and maintain feed conversion.
  • Matching implant potency to animal age, weight, and production goals is crucial for consistent results.

Conclusions:

  • Lifetime implant programs require careful consideration of product, timing, and sequence for optimal growth and efficiency.
  • Strategic implanting, starting with low-potency and progressing to high-potency products, maximizes lifetime performance.
  • Maintaining hormone blood levels within an optimal range is essential to avoid negative side effects and ensure desired outcomes.