Carcass traits, muscle characteristics, and palatability attributes of lambs expressing the callipyge phenotype.
Carcass traits, muscle characteristics, and palatability attributes of lambs expressing the callipyge phenotype.
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表达 callipyge 表型的羔羊的胴体特征、肌肉特征和适口性属性。
DOI：
10.1016/s0309-1740(01)00038-9
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发表时间：
2001
期刊：
影响因子：
7.1
通讯作者：
J. Savell
中科院分区：
文献类型：
--
作者：
K. J. Goodson;R. Miller;J. Savell
分别饲喂表现正常表型（正常，n=10）和calipyge表型（CLPG，n=9）的多赛特×萨福克杂交种，并在达到最大生长潜力时屠宰。胴体重差异不显著（P>0.05），但脂肪厚度较低（0.30 vs. 0.56 cm），眼肌面积较大（24.4 vs. 16.6 cm 2），美国农业部产量等级提高（1.6 vs. 2.6）（P < 0.05）。CLPG组胴体的可切割性和肌骨比均较好，脂肪含量较低，瘦肉含量较高（P<0.05）。股二头肌（BF），半腱肌（ST），半膜肌（SM），胸腰最长肌（LTL）和肱三头肌（TB）被用来比较两种表型的肌肉特征。正常羔羊肌肉中钙蛋白酶抑制蛋白活性较低，脂肪含量较高，水分含量较低（P<0.05）。胶原蛋白的总量和溶解度不受表型的影响，也不是肌节长度。仅评价BF和LTL的剪切力和训练感官属性。正常和CLPG BF之间的剪切力值没有差异，而CLPG LTL的剪切力值高于正常LTL（P< 0.05）。股二头肌没有不同的表型之间的训练感觉面板评级。然而，CLPG LTL的结缔组织量、肌原纤维和总体压痛的感觉评分最低（分别为6.11、4.97和4.95），而正常LTL的评分最高（P < 0.05;分别为7.10、7.00和6.90）。CLPG表型有一个积极的影响胴体特性，但有一些肌肉的嫩度的负面影响，可能通过肌原纤维成分的肌肉。
Dorset×Suffolk crossbred wethers expressing a normal phenotype (normal, n=10) and callipyge phenotype (CLPG, n=9) were fed individually and slaughtered upon reaching maximum growth potential. Carcass weight did not differ (P>0.05), but fat thickness was lower (0.30 vs. 0.56 cm), ribeye area was greater (24.4 vs. 16.6 cm2), and USDA yield grade was improved (1.6 vs. 2.6) for CLPG carcasses (P < 0.05). Carcasses from CLPG demonstrated higher cutability and a more desirable muscle to bone ratio, with less fat and more lean as a percentage of total side weight (P<0.05). Biceps femoris (BF), semitendinosus (ST), semimembranosus (SM), longissimus thoracis et lumborum (LTL), and triceps brachii (TB) were used to compare muscle characteristics of both phenotypes. Muscle from normal lambs had lower calpastatin activity, higher fat percentages and lower moisture percentages (P<0.05). Total amount and solubility of collagen were not affected by phenotype nor was sarcomere length. Shear force and trained sensory attributes were evaluated for BF and LTL only. Shear force values did not differ between normal and CLPG BF while CLPG LTL had higher (P< 0.05) shear force values than normal LTL. Biceps femoris did not differ between phenotypes in trained sensory panel ratings. However, CLPG LTL received the lowest sensory ratings for connective tissue amount and myofibrillar and overall tenderness (6.11, 4.97, and 4.95, respectively) and the normal LTL received the highest ratings (P < 0.05; 7.10, 7.00, and 6.90, respectively). The CLPG phenotype had a positive influence on carcass characteristics but had a negative influence on tenderness of some muscles, possibly through the myofibrillar component of the muscle.
羔羊肌肉肥大状况（callipyge）：对肌肉生长和肉品质性状影响的表征。
影响因子：
3.3
作者：
Koohmaraie,M;Shackelford,SD;Wheeler,TL;Lonergan,SM;Doumit,ME
通讯作者：
Doumit,ME