College of Grassland Science and Technology, China Agricultural University, Beijing, China.
Dryland Farming Institute, Hebei Academy of Agricultural and Forestry Sciences, Hengshui, China.
Anim Sci J. 2022 Jan-Dec;93(1):e13700. doi: 10.1111/asj.13700.
Silages processed with gramineous grass and wood feed mixtures may have positive associative effects on silage quality and animal performance when ruminants are fed those silages. The present study was conducted to evaluate the fermentation quality, chemical composition, and in vitro rumen digestion characteristics of silages produced with mixtures of sweet sorghum (SS) and korshinsk pea shrub (KP) in six different ratios of fresh weights: 100:0 (0%KP), 80:20 (20%KP), 60:40 (40%KP), 40:60 (60%KP), 20:80 (80%KP), and 0:100 (100%KP). As the proportion of KP increased in the silages, the contents of lactic acid, acetic acid, starch, total phenolics, hydrolysable tannins, and condensed tannins decreased (p < 0.05), while the pH value and the contents of neutral detergent fiber, acid detergent fiber, ether extract, crude protein, and ash increased (p < 0.05). The silages were evaluated in 48 h incubations with rumen liquor. The in vitro dry matter digestibility, in vitro neutral detergent fiber digestibility, and in vitro gas production decreased as the proportion of KP increased (p < 0.05). This study suggests that ensiling SS-KP at a ratio of 80:20 is a practical method for preserving such low-DM forages (SS) and that these silage mixtures offer an opportunity to optimize the nutrient supply for ruminant production.
当反刍动物采食这些青贮料时，用禾本科草和木本饲料混合物加工的青贮料可能对青贮料质量和动物生产性能产生积极的关联效应。本研究旨在评估甜高粱（SS）和中间锦鸡儿（KP）以 6 种不同鲜重比例（0%KP、20%KP、40%KP、60%KP、80%KP 和 100%KP）混合青贮的发酵品质、化学组成和体外瘤胃消化特性。随着青贮中 KP 比例的增加，乳酸、乙酸、淀粉、总酚、可水解单宁和缩合单宁的含量降低（p<0.05），而 pH 值、中性洗涤纤维、酸性洗涤纤维、乙醚提取物、粗蛋白和灰分的含量增加（p<0.05）。用瘤胃液在 48 h 孵育评估青贮料。随着 KP 比例的增加，体外干物质消化率、体外中性洗涤纤维消化率和体外产气量降低（p<0.05）。本研究表明，SS-KP 以 80:20 的比例青贮是保存低 DM 饲料（SS）的实用方法，这些青贮混合物为反刍动物生产提供了优化养分供应的机会。
