Department of Human Biology, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa; Department of Medical Bioscience, University of the Western Cape, Private Bag X17, Bellville 7535. South Africa.
Department of Human Biology, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa.
Meat Sci. 2023 Jun;200:109156. doi: 10.1016/j.meatsci.2023.109156. Epub 2023 Mar 5.
Muscle fiber type, fiber cross-sectional area (CSA), enzyme activities (citrate synthase (CS), 3-hydroxyacetyl Co A dehydrogenase (3HAD), lactate dehydrogenase (LDH) and phosphofructokinase (PFK)) and glycogen content were analyzed in the M. iliotibialis cranialis (ITC), M. iliotibialis lateralis, M. gastrocnemius (G) and M. fibularis longus (FL) muscles from 24 ostriches. Type I and II fiber proportions were similar across the 4 muscles, but the ITC had overall the smallest fibers. CS activity was the highest in the ITC, but similar between the remainder of the muscles. 3HAD activities were very low in all muscles, ranging between 1.9 and 2.7 μmol/min/g protein, indicating poor β-oxidation. The ITC also had the lowest PFK activity. Glycogen content averaged ∼85 mmol/kg dry weight across the muscles with large intramuscular variations. The 4 ostrich muscles present with low fat oxidation capacity and low glycogen content, which could have significant implications on meat quality attributes.
从 24 只鸵鸟中分析了阔筋膜张肌（ITC）、髂胫束外侧肌、比目鱼肌（G）和腓骨长肌（FL）的肌纤维类型、纤维横截面积（CSA）、酶活性（柠檬酸合酶（CS）、3-羟酰基辅酶 A 脱氢酶（3HAD）、乳酸脱氢酶（LDH）和磷酸果糖激酶（PFK））和糖原含量。4 种肌肉中的 I 型和 II 型纤维比例相似，但 ITC 的纤维总体上最小。CS 活性在 ITC 中最高，但其余肌肉之间相似。所有肌肉的 3HAD 活性都非常低，范围在 1.9 至 2.7 μmol/min/g 蛋白之间，表明β-氧化能力差。ITC 的 PFK 活性也最低。糖原含量在 4 种鸵鸟肌肉中平均约为 85 mmol/kg 干重，但肌肉内变化很大。这 4 种鸵鸟肌肉的脂肪氧化能力低，糖原含量低，这可能对肉质属性有重大影响。
