Centro de Investigación en Alimentación y Desarrollo, A. C., Carretera Gustavo Enrique Astiazarán Rosas, No. 46, Hermosillo, Sonora 83304, Mexico.
Universidad Autónoma de Baja california, Instituto de Ciencias Agrícolas, Valle de Mexicali, Baja California 21705, Mexico.
Meat Sci. 2021 Jul;177:108490. doi: 10.1016/j.meatsci.2021.108490. Epub 2021 Mar 8.
Muscle fiber morphometry and physicochemical characteristics were evaluated in LT muscles obtained from entire male lambs treated with zilpaterol hydrochloride (ZH, 0 and 0.15 mg/kg body weight) and/or steroidal implant (SI, with and without trenbolone acetate/estradiol). ZH and SI acted synergistically to increase LT area, type-IIb fiber cross-sectional area and soluble collagen content, likewise to decrease metmyoglobin concentration and insoluble collagen content. Ash content and ultimate pH showed a decrease due to an antagonistic effect between ZH and SI. Content of total collagen, protein, fat, moisture, oxidized lipids and water-holding capacity were unaffected by ZH and SI. Supplemental ZH, but not SI, decreased all color parameters and tended to increase shear force. Overall, the SI implantation of male lambs followed by a ZH supplementation promoted greater LT hypertrophy, without affecting protein and fat content, and physicochemical characteristics in their meat.
肌肉纤维形态计量学和物理化学特性评估是在使用盐酸齐帕特罗（ZH，0 和 0.15mg/kg 体重）和/或甾体植入剂（SI，有和没有 trenbolone acetate/estradiol）处理的雄性羔羊的 LT 肌肉中进行的。ZH 和 SI 协同作用，增加 LT 面积、IIb 型纤维横截面积和可溶性胶原蛋白含量，同时降低 metmyoglobin 浓度和不溶性胶原蛋白含量。由于 ZH 和 SI 之间的拮抗作用，灰分含量和最终 pH 值降低。总胶原蛋白、蛋白质、脂肪、水分、氧化脂质和持水能力含量不受 ZH 和 SI 的影响。补充 ZH，但不是 SI，降低了所有颜色参数，并倾向于增加剪切力。总体而言，雄性羔羊的 SI 植入后补充 ZH 促进了 LT 的更大肥大，而不影响其肉中的蛋白质和脂肪含量以及理化特性。
