In this study, we aimed to assess the effects of probiotic administration on the digestibility characteristics and growth performance of finishing beef cattle fed a total mixed ration (TMR) containing different levels of corn stover. One hundred and sixty Simmental × Continental crossbred bulls were randomly allocated to two animal houses (80 bulls each) and randomly assigned four TMR differing in the level of corn stover—high (HCT) and low (LCT)—with or without probiotics in each animal house. Feeding HCT supplemented with probiotics increased (P < 0.05) the apparent digestibility of crude protein (CP), ether extract (EE), neutral detergent fiber (NDF), and acid detergent fiber (ADF). Regardless of probiotic supplementation, the nitrogen intake and fecal nitrogen levels of animals fed HCT were lower than those fed LCT (P < 0.05). Additionally, feeding probiotics increased (P < 0.05) the efficiency of ruminal fermentation, final body weight, and average daily gain (ADG) of animals, with this effect being stronger in animals fed HCT. In conclusion, supplementing probiotics with HCT has a positive effect on the growth of finishing beef cattle, thereby providing economic benefits.

中文翻译：

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益生菌对饲喂不同玉米秸秆全混合日粮的肥育肉牛消化特性和生长性能的影响

在这项研究中，我们旨在评估益生菌给药对饲喂含有不同水平玉米秸秆的全混合日粮 (TMR) 的肥育肉牛消化率特性和生长性能的影响。将 160 头西门塔尔 × 大陆杂交公牛随机分配到两个动物舍（每个 80 头公牛），并随机分配四个 TMR，玉米秸秆水平不同——高（HCT）和低（LCT）——每个中有或没有益生菌动物屋。补充益生菌的喂养 HCT 增加（P < 0.05) 粗蛋白 (CP)、醚提取物 (EE)、中性洗涤纤维 (NDF) 和酸性洗涤纤维 (ADF) 的表观消化率。无论是否补充益生菌，饲喂 HCT 的动物的氮摄入量和粪便氮水平均低于饲喂 LCT 的动物（P  < 0.05）。此外，饲喂益生菌可提高 ( P  < 0.05) 动物的瘤胃发酵效率、最终体重和平均日增重 (ADG)，这种效果在饲喂 HCT 的动物中更为明显。综上所述，用HCT补充益生菌对肥育肉牛的生长有积极作用，从而提供经济效益。