Miron J, Ben-Ghedalia D
Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel.
J Dairy Sci. 1994 Dec;77(12):3624-30. doi: 10.3168/jds.S0022-0302(94)77307-0.
Alfalfa was ensiled by the conventional wilting process or as a mixture of 70% fresh alfalfa plus 30% wheat straw treated with SO2. The effects of these silages on the digestibility of monosaccharide constituents of the TMR by dairy cows was examined. Ten cows in early lactation were divided into two groups of 5 that had similar performance data at the onset of the experiment. Cows were fed for ad libitum intake for 28 d a TMR composed of 70% concentrates, 15% alfalfa hay, and 15% silage. The alfalfa silage had lower glucose, xylose, and total carbohydrates than the silage of alfalfa plus wheat straw treated with SO2. Digestibilities of DM (70 to 71%), OM (72%), and total carbohydrate (83%) were similar in the two TMR. The digestibilities of NDF carbohydrate for both TMR were similar. Regardless of treatment, NDF glucose was more digestible than NDF xylose and NDF uronic acid and less digestible than NDF arabinose, galactose, and mannose. The digestibility of total neutral detergent-soluble carbohydrates was 89% in both TMR, but those of neutral detergent-soluble xylose, mannose, and galactose were lower than those of neutral detergent-soluble glucose, arabinose, and pectin.
紫花苜蓿通过传统的萎蔫工艺青贮，或者作为70%新鲜紫花苜蓿加30%经二氧化硫处理的小麦秸秆的混合物青贮。研究了这些青贮饲料对奶牛全混合日粮（TMR）中单糖成分消化率的影响。十头处于泌乳早期的奶牛被分为两组，每组5头，在实验开始时性能数据相似。奶牛自由采食由70%精料、15%苜蓿干草和15%青贮饲料组成的TMR，持续28天。紫花苜蓿青贮饲料中的葡萄糖、木糖和总碳水化合物含量低于经二氧化硫处理的紫花苜蓿加小麦秸秆的青贮饲料。两种TMR中干物质（DM，70%至71%）、有机物（OM，72%）和总碳水化合物（83%）的消化率相似。两种TMR中中性洗涤纤维碳水化合物的消化率相似。无论处理方式如何，中性洗涤纤维葡萄糖的消化率高于中性洗涤纤维木糖和中性洗涤纤维糖醛酸，低于中性洗涤纤维阿拉伯糖、半乳糖和甘露糖。两种TMR中总中性洗涤纤维可溶性碳水化合物的消化率均为89%，但中性洗涤纤维可溶性木糖、甘露糖和半乳糖的消化率低于中性洗涤纤维可溶性葡萄糖、阿拉伯糖和果胶。
