This study was conducted to evaluate silage fermentation and protein degradation of alfalfa prepared with corn or sweet sorghum (SS) at different mixing ratios. The chemical composition, ensiling characteristics, and protein degradation of alfalfa prepared with and without corn or SS at mixing ratios of 7:3, 1:1, and 3:7 on a fresh matter (FM) basis were studied. The alfalfa had the highest crude protein (CP) content and lactate buffering capacity (LBC), but lower water-soluble carbohydrate (WSC) content than corn and SS. After 60 days of ensiling, the corn and SS silages had good quality, with lower pH and ammonia-N content, and higher dry matter (DM) content than the alfalfa silages. In the alfalfa and corn mixture silages, the DM contents linearly increased with an increase in the proportion of corn, while the pH, non-protein N (NPN), ammonia-N, and peptide-N contents linearly decreased. In the alfalfa and SS mixture silages, the DM and NPN contents linearly increased with an increase in the proportion of SS, while the pH, lactic acid, and ammonia-N contents linearly decreased. This study suggests that alfalfa silage prepared with corn has more positive effect on fermentation quality and inhibiting protein degradation than addition of SS.

中文翻译：

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内蒙古半干旱地区玉米与甜高粱青贮苜蓿青贮特性及蛋白质降解比较分析[J].

本研究旨在评估以不同混合比例的玉米或甜高粱 (SS) 制备的紫花苜蓿的青贮发酵和蛋白质降解。研究了以新鲜物质 (FM) 为基础，以 7:3、1:1 和 3:7 的混合比例制备的含有和不含玉米或 SS 的紫花苜蓿的化学成分、青贮特性和蛋白质降解。紫花苜蓿的粗蛋白（CP）含量和乳酸缓冲能力（LBC）最高，但水溶性碳水化合物（WSC）含量低于玉米和SS。青贮60天后，玉米和SS青贮品质良好，pH和氨氮含量较低，干物质（DM）含量高于苜蓿青贮。在苜蓿和玉米混合青贮饲料中，DM含量随着玉米比例的增加而线性增加，而pH、非蛋白N（NPN）、氨-N、肽-N含量呈线性下降。在苜蓿和SS混合青贮饲料中，DM和NPN含量随着SS比例的增加呈线性增加，而pH、乳酸和氨氮含量呈线性下降。该研究表明，与添加SS相比，用玉米制备的苜蓿青贮饲料对发酵品质和抑制蛋白质降解具有更积极的影响。