Hormone Implant use in Cattle

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Hormone Implant use in Cattle

• Shelia Howard and Jesse Frank

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Growth Hormones

• What are growth hormones?
• Substances that stimulate growth
• Purposes
• Promote growth rates, feed efficiency, feed
  conversions, and protein deposition, carcass
  leanness, carcass yields, and longissimus area.
• How to implant
• Load gun with the growth hormone, cock lever
  back, insert at the base of the ear, needle
  between cartilage and skin, pull trigger and
  needle retracts itself.
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A Little Bit Of History

• DES
• Diethylstilbestrol anabolic steroid originally
  synthesized to prevents miscarriages in pregnant
  women agriculture industry used in fattening
  rations for ruminant animals (cattle and sheep)
• Poultry
• First animals to be introduced to DES
• Cattle
• Today beef cattle almost exclusively only animals
  associated with growth hormones
• Steers VS. Heifers
• Heifers have a much lower rate of gain than
  steers or bulls

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Why Use Growth Hormones

• Pros
• Animal
• Hormones decrease amount of carcass fat
• Not foreign to animals bodies
• Consumer
• Decreased carcass fat which in return results in
  leanness and increase gains and efficiencies
  healthier meal
• Producer
• Decreased carcass fat which in return results in
  leanness and increase gains and efficiencies
• Increased growth rates less feed per pound of
  gain in return cheaper
• Greater return on calves

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Why Not Use Growth Hormones

• Cons
• Animal
• Increased skeletal growth and skeletal maturity
  aging causing small amounts of bone and cartilage
  growth
• DNA and Chromosome damages mutations in the
  genetic systems
• Consumer
• Decreased marbling not as good of flavor
• Likelihood of dark cutters tougher meat and bad
  taste
• Producer
• Decreased marbling and Likelihood of dark
  cutters, in turn, cut down on return

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Today

• 24 FDA approved hormones
• Estrogen based
• Androgen based
• Progestin based
• Often a combination

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Synovex Plus

• 200 mg of trenbolone acetate and 28 mg of
  estradiol benzoateFor increased rate of weight
  and improved feed efficiency in steers and for
  increased rate of weight gain in heifers fed in
  confinement for slaughter. Approved for feedlot
  steers and heifers.

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Alternatives

• Not Use Growth Hormones
• Oral Administration

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Conclusion

• Use growth hormones

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• Food Estrogenic Activity in
  nanograms/lbs of food
• Soybean Oil 908,000
• Cabbage 10,896
• Eggs 15,890
• Milk 59
• Beef from pregnant cow 636
• Beef from implanted cattle 10
• Beef from non-implanted cattle 7
• Adapted from Preston, 1997