南方红壤山区鱼用优质牧草利用技术研究

Utilization of quality forage as fish fodder in the mountainous red soil area of south China

通过牧草生产性能试验表明,在南方红壤山区种植的禾本科牧草品种杂交狼尾草Pennisetum ameri-canum×P.purpureumcv.23A×N51年鲜草产量达160 294.2 kg/hm2、豆科牧草品种印度豇豆Vignasinensis年鲜草产量达92 093.8 kg/hm2,二者的供草期长、刈割性能好,可以作为山区鱼用牧草当家品种。结合牧草的营养价值和草鱼可利用的产量来看,杂交狼尾草鱼用最佳刈割期为28 d。经过60 d喂养试验,全配合饲料组每尾净增重0.58 kg,添加杂交狼尾草组每尾净增重0.94 kg,比全配合饲料组增重62.1%;添加印度豇豆组每尾净增重0.90 kg,比全配合饲料组增重55.2%。

The annual fresh weight of Pennisetum americanum× P. purpureum cv. 23A× N51 which grows in the mountainous red soil area of south China reached 160294.2 kg/hm^2 , that of Vigna sinensis reached 92 093.8 kg/hm^2. Both of these two forages possess the merits of long green--fodder providing period, rapid recovering capacity after cutting, may serve as major cropping varieties for pisciculture in the mountain areas. The suitable harvesting period of P. americanum × P. purpureum for fish use is 28 d. In a 60 d trail, the weight gain per piece fish in the group feeding compound feed was 0. 58 kg, that in the group supplementing P. americanum × P. purpureum cv. 23A×N51 was 0. 94 kg, in the group supplementing Vigna sinensis was 0.90 kg, is 62. 1% and 55.2% higher respectively than that of feeding compound feed.