Ractopamine Hydrochloride Did Not Impact Carcass Traits, Muscle Fiber Types, or Sensory Traits of Long-Fed Yearling Heifers
| Autor: | E. N. Hunter-Beasley, L. K. Anderson, Chris R. Kerth, C. W. Rowe, T. D. Brandebourg, Christy L. Bratcher |
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| Rok vydání: | 2018 |
| Předmět: |
Fiber type
Marbled meat 0402 animal and dairy science lcsh:TX341-641 04 agricultural and veterinary sciences Biology 040401 food science 040201 dairy & animal science Crossbreed Tenderness 0404 agricultural biotechnology Animal science Longissimus Ractopamine hydrochloride medicine lcsh:Animal culture Muscle fibre medicine.symptom lcsh:Nutrition. Foods and food supply lcsh:SF1-1100 |
| Zdroj: | Meat and Muscle Biology, Vol 2, Iss 1, Pp 83-91 (2018) |
| ISSN: | 2575-985X |
| DOI: | 10.22175/mmb2017.07.0038 |
| Popis: | Crossbred heifers (n = 64; animal was the experimental unit) were assigned to 1 of 8 treatments in a 4 × 2 factorial arrangement, with 4 treatment days-on-feed (DOF; 79, 100, 121, 142) and 2 levels of ractopamine hydrochloride (RAC) supplementation (0 or 300 mg × hd–1 × d–1). At 24 h postmortem, carcass traits were determined by trained personnel and longissimus samples were removed for muscle fiber type analyses. Boneless strip loins (IMPS #180) were fabricated and vacuum-packaged at 24 h postmortem and aged for 21 d, cut into 2.54 cm thick steaks, then frozen for no longer than 6 mo. After thawing for 24 h, Warner-Bratzler shear force (WBSF) and trained sensory panel analyses were conducted. Marbling was greater (P < 0.05) for control (CON; 0 mg x hd-1 x d-1 ractopamine hydrochloride) heifers than RAC heifers fed for either 79 or 100 d, but lower (P < 0.05) for CON heifers than RAC heifers fed for either 121 or 142 DOF. Feeding RAC had no effect (P > 0.05) on carcass traits, muscle fiber histology, or meat quality. The addition of RAC had no effect (P > 0.05) on Warner-Bratzler shear force. Feeding RAC had no negative impacts on carcass traits or meat quality and actually improved marbling scores in longer-fed heifers. |
| Databáze: | OpenAIRE |
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