Weissbach F, Prym R
Arch Tierernahr. 1978 Jun;28(6):433-49. doi: 10.1080/17450397809426824.
Four series of pelleting experiments were conducted using straw from winter rye and winter wheat crops. Pelleting was done with and without grain addition. In each of the experimental series, 7 NaOH dosage levels were tested Further, 2 to 5% urea were added to the mixture to be pelleted. The 28 different pellet batsches and untreated straw were fed to sheep to study digestibility. Evaluation by difference trial revealed that straw pelleting without NaOH addition reduces the digestibility of organic matter by 4.7 units, on the average, whilst NaOH addition was found to increase digestibility depending on the dose applied. The following relationship was found between digestibility of straw dry matter (y) and NaOH dose in g/kg straw dry matter (x): y = 43.4 + 0.358x -0.00116x2. The grain proportion proved largely inert as far as the NaOH action is concerned. In one experimental series in which wheat straw without grain addition had been compacted at high pressing temperatures, an additional disintegration effect was observed irrespective of the NaOH dose applied. It increased digestibility by 8.0 units and is very likely to originate from the specific action of urea.
使用冬黑麦和冬小麦作物的秸秆进行了四组制粒实验。制粒过程中有的添加了谷物，有的未添加。在每个实验系列中，测试了7种氢氧化钠用量水平。此外，向待制粒的混合物中添加了2%至5%的尿素。将28种不同的颗粒批次和未处理的秸秆喂给绵羊以研究消化率。差异试验评估表明，不添加氢氧化钠的秸秆制粒平均会使有机物消化率降低4.7个单位，而添加氢氧化钠会根据用量增加消化率。发现秸秆干物质消化率（y）与每千克秸秆干物质中氢氧化钠用量（x）之间存在以下关系：y = 43.4 + 0.358x - 0.00116x²。就氢氧化钠的作用而言，谷物比例在很大程度上表现为惰性。在一个实验系列中，未添加谷物的小麦秸秆在高温压制下被压实，无论氢氧化钠用量如何，都观察到了额外的崩解效果。它使消化率提高了8.0个单位，很可能源于尿素的特定作用。
