The higher bioavailability, lower toxicity, and lower potential environmental risks of zinc oxide nanoparticles (ZnO NPs) compared to traditional sources of zinc (Zn) encouraged researchers to use it in animal diets. The current study aimed to investigate the effects of dietary low ZnO NPs levels supplementation on the meat yield of Shami goats using ultrasound examination. A total of thirty healthy female Shami goats with an average body weight of 38.43 ± 1.94 kg at 2–3 years old were randomly distributed into three equal groups (10 goats/group). The first group was fed a basal diet (control), while the second and third groups were fed a basal diet supplemented with 11.25 mg/kg (T1) and 22.50 mg/kg (T2) dry matter (DM) of ZnO NPs, respectively, for 12 weeks. Longissimus dorsi muscle ultrasound evaluation at both the thoracic and lumbar regions revealed denser transverse process-related acoustic shadowing (TS), rib-related acoustic shadowing (RS), and muscular shadowing (MS) in goats supplemented with ZnO NPs, T1 and T2, compared to goats fed a control diet. Furthermore, ultrasound measurements of the thoracic and lumbar longissimus dorsi regions of goats supplemented with ZnO NPs at both levels revealed greater fat thickness, depth, perimeter, and area compared to animals fed a control diet (p < 0.05). This improved trend was dose-dependent, with T2 values being higher than T1 values (p < 0.05). In conclusion, the ultrasound assessment results showed that supplementing Shami goats with ZnO NPs at these two low levels enhanced meat yield.

与传统的锌 (Zn) 来源相比，氧化锌纳米颗粒 (ZnO NPs) 具有更高的生物利用度、更低的毒性和更低的潜在环境风险，这鼓励研究人员将其用于动物饮食。目前的研究旨在通过超声检查研究日粮中添加低 ZnO NPs 水平对沙米山羊产肉量的影响。将 30 只 2-3 岁平均体重为 38.43 ± 1.94 kg 的健康雌性沙米山羊随机分为三个相等的组（10 只山羊/组）。第一组喂食基础饲料（对照），而第二组和第三组喂食分别添加 11.25 mg/kg (T1) 和 22.50 mg/kg (T2) 干物质 (DM) ZnO NPs 的基础饲料, 12 周。背最长肌胸部和腰部的肌肉超声评估显示，与 ZnO NPs、T1 和 T2 相比，山羊的横向过程相关声影 (TS)、肋骨相关声影 (RS) 和肌肉阴影 (MS) 更密集山羊喂食对照饮食。此外，与饲喂对照饮食的动物相比，在两个水平上补充了 ZnO NPs 的山羊的胸部和腰背最长肌区域的超声测量显示出更大的脂肪厚度、深度、周长和面积 ( p < 0.05)。这种改善趋势是剂量依赖性的，T2 值高于 T1 值（p< 0.05)。总之，超声评估结果表明，在沙米山羊中添加这两种低水平的 ZnO NPs 可提高产肉率。