Abstract: Dynamic change of forage yield and quality in Stylosanthes guianensis cv.Reyan No.5 during its growing cycle was studied.The results showed that crude protein (CP) and N-free extract (NFE) content were lower while crude fiber (CF) content was higher at the highest nutrient growing period.A positive correlation between dry matter (DM) and CF was significant.A negative correlati on between DM and NFE was also significant.The analysis results indicated that CP and CF were main elements of nutrient value while CP and CF as well as Ash were main indexes of feeding value.The regression formula among nutrient value and feeding value as well as nutrient content was formed.

Key words: Stylosanthes guianensis, Forage yield, Quality, Dynamic change

摘要： 研究热研5号柱花草的产草量和质量及其相互关系。结果表明,生物产量达高峰的营养盛期,粗蛋白质和无氮浸出物含量均较低,而粗纤维含量则较高。干物质与粗纤维呈显著的正相关关系,干物质与无氮侵出物呈显著的负相关关系,干物质与粗蛋白质、粗脂肪的相关性均不显著。分析结果表明,粗蛋白质、粗纤维是影响营养价值的主要指标。粗蛋白质、粗纤维和粗灰分是影响饲用价值的主要指标,并确立营养价值和饲用价值与养分含量之间的回归方程。

关键词: 柱花草, 产量, 质量, 动态变化