Estación Experimental "Guillermo Covas" de INTA Anguil, CC 11, km 580 ruta nac. 5, La Pampa 6326, Argentina; Facultad de Ciencias Veterinarias, Universidad Nacional de La Pampa, 6300 La Pampa, Argentina.
Estación Experimental "Guillermo Covas" de INTA Anguil, CC 11, km 580 ruta nac. 5, La Pampa 6326, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, 6300 La Pampa, Argentina.
Meat Sci. 2021 Jul;177:108493. doi: 10.1016/j.meatsci.2021.108493. Epub 2021 Mar 13.
Four ages at harvest (HA: A15, A18, A24 and A30 for 15, 18, 24 and 30 months, respectively) were compared in performance, carcass and meat traits of feedlot finished steers over a 123-day period. Three meat aging periods (postmortem days: 2, 7 and 14) were imposed on a longissimus thoracis muscle (LM) section of each left carcass. Feed efficiency (FE) was greater (P ≤ 0.02) for A15 and A18. Treatment A30 had the lowest FE (P ≤ 0.02). The LM area was largest for A30, but no different (P = 0.15) from A24. Intramuscular fat was lowest (P < 0.01) for A15. No differences were detected (P ≥ 0.11) among the A18, A24 and A30. Treatment A30 had the highest rib fat thickness (P ≤ 0.02) and WBsf values. No differences were detected (P ≥ 0.25) in WBSf between A15, A18 and A24 after any aging period. Results suggested A24 as a threshold for carcass and meat traits.
在 123 天的时间内，比较了收获时的四个年龄（HA：A15、A18、A24 和 A30，分别代表 15、18、24 和 30 个月）对育肥场完成的阉牛的性能、胴体和肉质特性的影响。对每个左胴体的背最长肌（LM）部分施加了三个肉老化期（宰后天数：2、7 和 14）。A15 和 A18 的饲料效率（FE）更高（P≤0.02）。A30 的 FE 最低（P≤0.02）。A30 的 LM 面积最大，但与 A24 无差异（P=0.15）。A15 的肌内脂肪最低（P<0.01）。A18、A24 和 A30 之间没有差异（P≥0.11）。A30 的肋脂肪厚度最高（P≤0.02）和 WBsf 值。在任何老化期后，A15、A18 和 A24 之间的 WBSf 值没有差异（P≥0.25）。结果表明 A24 是胴体和肉质特性的一个阈值。
