Growth, carcass traits and meat quality of bulls of three biotypes subjected to re-implantation and supplementation in improved tropical savannah
Bull calves representing three biotypes: Predominant Bos indicus (TROPBI; n = 24); tropically-adapted taurine x TROPBI crossbred (TROP-Taurus-Indicus, n = 32) and temperate B. taurus x TROPBI crossbred (TEMP-Taurus-Indicus, n = 33)] were selected and randomly assigned to pasture supplementation treatments [mineral (CONTROL-SUPPL) or strategic protein-energy supplementation (STRT-SUPPL)] and implant regimes [RIMPL: repeated (d-0, d-90) Zeranol-72mg implantation (ZER-ZER) or Trenbolone Acetate-140 mg/Estradiol-20mg implantation (d-0) plus Zeranol-72mg implantation (d-90) (ESTBA-ZER)] to be compared in growth performance, cutability, textural [shear force (WBSF)] and sensorial quality (descriptive sensory ratings). The variance analyses indicated that TEMP-Taurus-Indicus exceeded TROP-Taurus-Indicus and TROPBI in body weight, daily gain, carcass weight, and frequency of the top Venezuelan quality category for bull carcasses (P < 0.015). Significant interactions of second order for the external fat finish score and first-order for the length of the pelvic member were detected. The TROP- and TEMP-Taurus-Indicus bulls exhibited larger ribeye areas than the TROPBI (P < 0.001) and more than 60% reached the top (USDA 1) yield grade (P = 0.022). There was a significant second-order interaction for the WBSF. Under STRT-SUPPL and ZER-ZER implant regime the TEMP-Taurus-Indicus exhibited lower WBSF values (4.72 kg) than TROP-Taurus-Indicus (5.57 kg; P = 0,003) and TROPBI (6.29 kg; P < 0,001). Steaks from animals STRT-SUPPL and ESTBA-ZER-implanted TROPBI required lower (P = 0.020) WBSF than those from ZER-ZER-implanted TROPBI. The results suggest that under the conditions presented herein: (a) greater performance for growth traits occurs in the descendance of TROPBI cows bred to TEMP taurine sires, (b) heterosis does not manifest for carcass or meat sensory quality, and (c) the modest improvements observed in tenderness (lower shear force) with the protein-energy supplement in the TEMP-Taurus-Indicus group seemed insufficient to be detected by Venezuelan consumers.
| Main Authors: | , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Asociacion Latinoamericana de Produccion Animal
2023
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| Online Access: | https://ojs.alpa.uy/index.php/ojs_files/article/view/3030 |
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