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J. L. Beckett, and J. Algeo Cal Poly State University Algeo Consulting

Study on impacts of varying implant protocols on cattle performance, carcass traits, and meat tenderness. Results show potential benefits of delaying implants for marbling and overall market strategy.

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J. L. Beckett, and J. Algeo Cal Poly State University Algeo Consulting

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  1. Effects of delayed implant protocols on performance, carcass characteristics and meat tenderness in Holstein steers J. L. Beckett, and J. Algeo Cal Poly State University Algeo Consulting

  2. Strategies • Approximately 20 implants approved for use in cattle • Tremendous number of combinations possible • Producers need to establish strategies that best utilize the advantages of the different implants • Long-fed cattle are particularly subjected to repetitive implant regimens

  3. Effects • Increase frame size • Increases growth curve • Decrease quality grade • Lower % Choice • Due to change in physiological endpoint • Increases muscling • Effect on tenderness?

  4. Implant Protocol Ralgro Ralgro Syn-S Revalor-S A Synovex-C Syn-S Revalor-S B Treatment Groups Synovex-C Rev-IS Revalor-S C Revalor-G Rev-IS Revalor-S D No Implant E 0 60 120 180 291

  5. Average Daily Gain

  6. Final Weight

  7. Gain to Feed

  8. Percentages of Holstein steer carcasses grading USDA Choice or better

  9. USDA Yield Grade

  10. Project Summary • Goal: Identify the time that implants can be initiated to: • Capture maximal growth and performance • Minimize detrimental effects on product • 186 steers on feed for 280 d • Initial weight 156 kg • Weighed every 30 days • At the end of the feeding phase, animals were harvested and carcass data collected

  11. Diet

  12. Average Finishing Ration Analysis • Dry matter 84% • Crude Protein 12.79% • NEg 1.23 Mcal/kg • NEm 1.95 Mcal/kg

  13. Experimental Protocol

  14. Final Weight

  15. Average Daily Gain

  16. Feed to Gain

  17. Longissimus Muscle Area

  18. Percentages of Holstein steer carcasses grading USDA Choice or better a ab abc bc c

  19. USDA Yield Grade

  20. Meat • Ribs aged for 14 days • 2 steaks from each rib were removed, individually vacuum packed • Steaks sent to Colorado State University • CSU measured tenderness (shear force) and conducted trained taste panel

  21. Warner-Bratzler Shear Force

  22. WB Shear Force over 5

  23. Trained Taste Panel a ab ab bc c

  24. Summary • Early implants dramatically influence marbling at a given weight • Delaying implants tend to improve marbling without significant effects on growth & efficiency • Aggressive nature of implant strategy should complement the market • Variations in tenderness can not be explained by the use of implants

  25. Percent Empty Body Fat

  26. Percent Empty Body Fat a ab ab b b

  27. Adjusted Final Body Weight a a a a b

  28. AFBW from nonimplanted Controls

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