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Effect of feeding regimen on meat quality, MyHC isoforms, AMPK, and PGC-1α genes expression in the biceps femoris muscle of Mongolia sheep.
Food Science & Nutrition ( IF 3.5 ) Pub Date : 2020-04-14 , DOI: 10.1002/fsn3.1494 Yanru Hou 1 , Lin Su 1 , Rina Su 1 , Yulong Luo 1 , Bohui Wang 1 , Duo Yao 1 , Lihua Zhao 1 , Ye Jin 1
Food Science & Nutrition ( IF 3.5 ) Pub Date : 2020-04-14 , DOI: 10.1002/fsn3.1494 Yanru Hou 1 , Lin Su 1 , Rina Su 1 , Yulong Luo 1 , Bohui Wang 1 , Duo Yao 1 , Lihua Zhao 1 , Ye Jin 1
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The effects of two feeding regimens on meat quality, myosin heavy chain (MyHC) types, and key factors regulating muscle fiber type (AMP‐activated protein kinase [AMPK] and peroxisome proliferator‐activated receptor‐coactivator‐1α [PGC‐1α]) in the biceps femoris muscle of Mongolia sheep were investigated. A total of 20 Mongolia sheep were weaning for 90 days and divided into two groups (pasture group (P) and confinement group (C)) at 10.36 ± 0.35 kg of weaning weight. After weaning, sheep were pasture fed or confinement fed for 9 months. The results showed that live weights, carcass weight, intramuscular fat (IMF), and Warner–Bratzler shear force (WBSF) in P group were significantly lower (p < .05) than that in C group. Compared with P group, color evaluations with respect to L* and b* values were significantly higher (p < .05) in C group. Expression of the MyHC I gene in the P group was significantly higher, while MyHC IIa and MyHC IIb genes expression was significantly lower (p < .05) than that in C group. Also, AMPK activity and expression of AMPKα2 and PGC‐1α genes were significantly higher (p < .05) in P group compared with C group. The present study indicated that muscle fiber composition was one of the key differences leading to the differences of meat quality in different feeding regimens. AMPK, particularly AMPKα2, and PGC‐1α were considered to be two key factors regulating muscle fiber types in Mongolia sheep. The results support that AMPK activity and the expression of AMPKα2 and PGC‐1α genes may affect the composition of muscle fibers; thus, AMPK activity and the expression of AMPKα2 and PGC‐1α genes had an effect on meat quality by changed composition of muscle fibers.
中文翻译：
饲喂方案对蒙古羊股二头肌肉品质、MyHC亚型、AMPK和PGC-1α基因表达的影响。
两种饲喂方案对肉质、肌球蛋白重链 (MyHC) 类型和调节肌纤维类型的关键因素（AMP 激活蛋白激酶 [AMPK] 和过氧化物酶体增殖物激活受体辅激活因子 1α [PGC-1α]）的影响对蒙古羊股二头肌进行了研究。断奶90天的蒙古羊共20只，按断奶体重10.36±0.35 kg分为两组（放牧组（P）和圈养组（C））。断奶后，羊采用草饲或圈养9个月。结果显示，P 组的活重、胴体重量、肌内脂肪（IMF）和 Warner-Bratzler 剪切力（WBSF）显着低于 C 组（ p < .05）。与 P 组相比，C 组中 L* 和 b* 值的颜色评价显着较高 ( p < .05)。 P 组中 MyHC I 基因的表达显着高于 C 组，而 MyHC IIa 和 MyHC IIb 基因表达显着低于 C 组 ( p < .05)。此外，与 C 组相比，P 组的 AMPK 活性以及 AMPKα2 和 PGC-1α 基因的表达显着较高 ( p < .05)。本研究表明，肌纤维组成是导致不同饲养方案肉质差异的关键差异之一。 AMPK，特别是 AMPKα2 和 PGC-1α 被认为是调节蒙古羊肌纤维类型的两个关键因素。结果支持AMPK活性以及AMPKα2和PGC-1α基因的表达可能影响肌纤维的组成；因此，AMPK 活性以及 AMPKα2 和 PGC-1α 基因的表达通过改变肌纤维的组成对肉品质产生影响。
更新日期：2020-04-14
中文翻译：
饲喂方案对蒙古羊股二头肌肉品质、MyHC亚型、AMPK和PGC-1α基因表达的影响。
两种饲喂方案对肉质、肌球蛋白重链 (MyHC) 类型和调节肌纤维类型的关键因素（AMP 激活蛋白激酶 [AMPK] 和过氧化物酶体增殖物激活受体辅激活因子 1α [PGC-1α]）的影响对蒙古羊股二头肌进行了研究。断奶90天的蒙古羊共20只，按断奶体重10.36±0.35 kg分为两组（放牧组（P）和圈养组（C））。断奶后，羊采用草饲或圈养9个月。结果显示，P 组的活重、胴体重量、肌内脂肪（IMF）和 Warner-Bratzler 剪切力（WBSF）显着低于 C 组（ p < .05）。与 P 组相比，C 组中 L* 和 b* 值的颜色评价显着较高 ( p < .05)。 P 组中 MyHC I 基因的表达显着高于 C 组，而 MyHC IIa 和 MyHC IIb 基因表达显着低于 C 组 ( p < .05)。此外，与 C 组相比，P 组的 AMPK 活性以及 AMPKα2 和 PGC-1α 基因的表达显着较高 ( p < .05)。本研究表明，肌纤维组成是导致不同饲养方案肉质差异的关键差异之一。 AMPK，特别是 AMPKα2 和 PGC-1α 被认为是调节蒙古羊肌纤维类型的两个关键因素。结果支持AMPK活性以及AMPKα2和PGC-1α基因的表达可能影响肌纤维的组成；因此，AMPK 活性以及 AMPKα2 和 PGC-1α 基因的表达通过改变肌纤维的组成对肉品质产生影响。
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