Rapeseed meal is an important feed protein source, and the amino acid composition has a close relationship with the processing quality of feed, of which serine, cystine and tyrosine are the semi-essential amino acids for most animals. By using newly developed two-genetic-system QTL mapping software and method for analyzing seed quality traits of dicotyledonous plants, two backcross populations from a set of doubled haploid(DH) lines derived from an elite hybrid cross between Tapidor and Ningyou 7 were used ...