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Muscle from grass- and grain-fed cattle differs energetically.
Meat Science ( IF 7.1 ) Pub Date : 2019-11-06 , DOI: 10.1016/j.meatsci.2019.107996
A Apaoblaza 1 , S D Gerrard 1 , S K Matarneh 1 , J C Wicks 1 , L Kirkpatrick 1 , E M England 1 , T L Scheffler 1 , S K Duckett 2 , H Shi 1 , S L Silva 3 , A L Grant 1 , D E Gerrard 1
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Insufficient acidification results in dark, firm, and dry beef. While this defect is often indicative of a stress event antemortem, muscle tissue may change in response to feeding regime. Longissimus dorsi muscle samples from 10 grain-fed and 10 grass-fed market weight, angus-crossbred beef cattle were collected postmortem. Lower (P < .05) L* and a* values were recorded for steaks from grass-fed cattle. Higher (P < .05) ultimate pH values were noted in lean of grass-fed cattle compared to grain-fed cattle, yet differences in lactate, glycogen and glucose were not detected. Further, increased (P < .05) ultimate pH values and lower (P < .05) lactate accumulations were noted when samples from grass-fed cattle were subjected to an in vitro glycolysis system. Muscle from grass-fed beef possessed nearly two-fold more (P < .05) succinate dehydrogenase and (P < .001) myoglobin than that of grain-fed cattle. These data show lean from grass-fed beef has greater enzymes reflective of oxidative metabolism and suggest dark lean from grass-fed cattle may be a function of more oxidative metabolism rather than a stress-related event antemortem.



中文翻译:

用草和谷物喂养的牛的肌肉有很大的不同。

酸化不足会导致牛肉变黑,变硬和变干。尽管此缺陷通常表示应激事件前,但肌肉组织可能会因进食方式而发生变化。死后收集来自10头谷物饲粮和10头市场饲草,安格斯杂交肉牛的背最长肌肌肉样品。 草饲牛的牛排的L *和a *值较低(P <.05)。 与饲喂谷物的牛相比,饲草瘦肉的牛的最终pH值更高(P <.05),但未检测到乳酸,糖原和葡萄糖的差异。此外, 当对草饲牛的样品进行 pH值测定时,观察到最终pH值增加(P <.05),乳酸累积量降低(P <.05)。体外糖酵解系统。草饲牛肉产生的肌肉 比谷物饲喂的牛拥有近两倍的(P  <.05)琥珀酸脱氢酶和(P <.001)肌红蛋白。这些数据表明,草食牛肉的瘦肉具有更多的反映氧化代谢的酶,表明草食牛肉的黑瘦肉可能是更多的氧化代谢的函数,而不是与压力相关的事件前验。

更新日期:2019-11-06
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