Qualities of Whitmania pigra in different-month-age and best harvest time Quality comparison of Hirudo before and after processed by French chalk Analysis of genetic differentiation and phylogenetic relationship between Whitmania pigra and Hirudo nipponia based on ITS sequence Studies on the Preparation Method for Compound Hirudo Oral Liquid Studies on growth and intake law of Whitmania pigra with temperature Optimization of wet ultrafine grinding technology for Hirudo extraction Studies on impact of temperature and weight in Whitmania pigra bred Studies on HPLC fingerprint of co-hirudo injection Comparation study on quality of different population of wild and breeding Whitmania pigra Establishment and optimization of ISSR-PCR reaction system for Hirudo nipponica