Main nutritional concentrations changed with developing stage of 23 alfalfa varieties in different cuttings, the concentrations of CP, EE, NFE, CASH, Ca, P and digestibility decreased, while CF, NDF, ADF content increased.

• 不同茬次23个苜蓿品种的营养成分含量随生育阶段的推移而变化，且在发育过程中的变化趋势基本一致：随生育阶段推移，CP、EE、NFE、CASh、Ca、P含量和有机物质消化率逐渐下降；