Study on yield and nutritional quality of hybrid improved progenity of rhizome-rooted Qingshui Medicago sativa
[Objective]Rhizome-rooted Medicago sativa cv. Qingshui is an excellent germplasm for establishing grazing and ecological grasslands,but its forage production performance is low. The purpose of this study was to im-prove the production performance of Qingshui alfalfa.[Method]The hybrid progeny selection strain RSA-03 of Qin-gshui and creeping-rooted Medicago sativa 'WL168' was used as the research object,and the parental Qingshui and WL168 were served as the control. The heterosis of hay yield,crude protein (CP),ether extract (EE),neutral deter-gent fiber (NDF),acid detergent fiber (ADF),crude ash (Ash) content and relative feed value (RFV) under differ-ent cuts were analyzed to investigate the yield trait and nutritional value.[Result]1) The annual hay yield of RSA-03 was lower than that of WL168 by 8.88％,while it was higher than that of Qingshui by 31.11％,indicating that the yield of RSA-03 showed obvious heterosis.The yields of WL168,Qingshui and RSA-03 showed:first cut>second cut>third cut.2) The ADF content of RSA-03 was significantly lower than that of Qingshui and WL168 by 2.62％ and 3.84％,respectively,and the RFV of RSA-03 was significantly higher than that of Qingshui by 2.26％,indicat-ing that the ADF content and RFV of RSA-03 showed obvious heterosis. The results showed that the nutritional value of all three varieties was different under each cut.3) The evaluation of their nutritional value by gray correlation method concluded that WL168>RSA-03>Qingshui.[Conclusion]The yield,nutritional quality,relative feed value and palatability of the parental Qingshui were improved to some extent after crossing it with the high yield and superior quality WL168,and the selected strain RSA-03 is suitable for the establishment of grazing-type grassland.
万方数据
维普
