An evaluation of tenderness of the longissimus muscle of Angus by Hereford versus Brahman crossbred heifers.
An evaluation of tenderness of the longissimus muscle of Angus by Hereford versus Brahman crossbred heifers.
复制标题
赫里福德与婆罗门杂交小母牛对安格斯最长肌嫩度的评估。
DOI：
10.2527/1991.691171x
复制
发表时间：
1991
影响因子：
3.3
通讯作者：
James O. Reagan
中科院分区：
文献类型：
--
作者：
S. Shackelford;S. Shackelford;M. Koohmaraie;M. Koohmaraie;M. F. Miller;M. F. Miller;J. Crouse;J. Crouse;James O. Reagan;James O. Reagan
对从 Angus-Hereford (n = 8) 和 5/8 Brahman 杂交 (n = 8) 小母牛屠宰后的老化进行研究，以确定肉嫩度变化的原因。对于 5/8 Brahman 杂交品种，生最长肌 (LM) 肌原纤维断裂指数较低，熟 LM Warner-Bratzler 剪切力较大（P 小于 0.05）。钙依赖性蛋白酶 (CDP) -I 和 -II 的活性不受品种影响（P 大于 0.05）；然而，5/8 婆罗门屠体中的 CDP 抑制剂活性较高（P 小于 0.05）。组织蛋白酶B和B+L的活性不受品种或宰后储存时间（0、1、3、7或14天）的影响。赫里福德-安格斯屠体第 12 肋骨相对较肥，并且具有较高的 USDA 产量等级和大理石花纹分数（P 小于 0.05）。赫里福德-安格斯杂交品种在 LM 外部形成的黑色、粗带较少，而瘦肉则较浅、质地较细（P 小于 0.05）。蒸煮损失 (%) 和蒸煮速率 (g/min) 不受品种或宰后老化的影响（P 大于 0.05）。 5/8 婆罗门屠体韧性的增加可能是由于 CDP 抑制剂活性的增加。
Postmortem aging of carcasses obtained from Angus-Hereford (n = 8) and 5/8 Brahman crossbred (n = 8) heifers was investigated to determine the cause of variation in meat tenderness. Raw longissimus muscle (LM) myofibril fragmentation index was lower and cooked LM Warner-Bratzler shear force was greater for the 5/8 Brahman crossbreds (P less than .05). The activities of calcium-dependent protease (CDP) -I and -II were not affected (P greater than .05) by breed; however, CDP inhibitor activity was higher (P less than .05) in the 5/8 Brahman carcasses. The activities of cathepsins B and B + L were not affected by breed or postmortem storage time (0, 1, 3, 7 or 14 d). Hereford-Angus carcasses were fatter opposite the 12th rib and had higher USDA yield grades and marbling scores (P less than .05). Hereford-Angus crossbreds had less dark, coarse band formation around the exterior of the LM and lighter, finer-textured lean (P less than .05). Cooking loss (%) and cooking rate (g/min) were not affected by breed or postmortem aging (P greater than .05). The increased toughness in the 5/8 Brahman carcasses may be due to increased CDP inhibitor activity.