Four Thai native bulls were used to evaluate the availability of mother liquor (ML), by‐product of monosodium glutamate, as a replacement of soybean meal (SBM) consisting of 10% in concentrate. The SBM was replaced by the ML at 0% (C), 20% (T1), 40% (T2), and 60% (T3), and the experiment was a randomized block design experiment. The animals were fed concentrate and roughage (60:40, on a dry matter [DM] basis). There were no significant differences in the digestibility of DM, crude protein, ether extract, acid detergent fiber expressed exclusive of residual ash and non‐fibrous carbohydrate, and energy and nitrogen balances among the treatments. However, the digestibility of the neutral detergent fiber in T2 was lower than the other treatments (p  < .05). The valeric acid of T2 was lower than those of C and T1 and the iso‐valeric acid of T3 was the lowest (p  < .05), followed by those of T2, T1, and C at 4 hr post‐feeding. No significant differences were observed in the ruminal total VFA concentrations, pH, and NH₃‐N among the treatments. These results suggested that SBM could be replaced by the ML up to 60% without adverse effects on nitrogen and energy balance, rumen conditions, and blood metabolites in Thai native bulls.

中文翻译：

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饲喂母液（味精的副产品）对泰国本地公牛的消化率、能量和氮平衡以及瘤胃状况的影响。

四头泰国本土公牛被用来评估母液 (ML) 的可用性，母液是味精的副产品，作为由 10% 浓缩物组成的豆粕 (SBM) 的替代品。SBM在0%（C）、20%（T1）、40%（T2）和60%（T3）处被ML取代，实验为随机区组设计实验。给动物喂精料和粗饲料（60:40，以干物质 [DM] 为基础）。DM、粗蛋白、乙醚提取物、不包括残留灰分和非纤维碳水化合物的酸性洗涤纤维的消化率以及能量和氮平衡在处理之间没有显着差异。然而，中性洗涤纤维在 T2 中的消化率低于其他处理（p < .05)。 在喂食后 4 小时，T2 的戊酸低于 C 和 T1， T3 的异戊酸最低 ( p < .05)，其次是 T2、T1 和 C。在处理之间，瘤胃总 VFA 浓度、pH 和 NH _{3 -N 没有观察到显着差异。}这些结果表明，SBM 可以被 ML 替代高达 60%，而不会对泰国本地公牛的氮和能量平衡、瘤胃状况和血液代谢物产生不利影响。