抄録
As for the high grass silage of the volatile basic nitrogens (VBN) content, most of VBN was volatilized by the air dry preprocessing treatment for forage test. The VBN which volatilized causes a loss in a nitrogen content in a sample. In other words, underestimate of crude protein (CP) content occurs. However, we cannot judge whether underestimate of CP occurs without measurement of VBN. But, it is not realistic to measure VBN of all samples from time and labor. In this report, we examined whether pH and water content of the silage became the index of underestimation of CP. The underestimate of more than 10% of CP was less likely to occur on the following conditions. These silage conditions were that pH was under than 4.2 and moisture content was less than 70%. VBN should be measured in the silage of except these conditions, and the real CP content should be grasped.
