播种红豆草二茬草地不同放牧管理方式育肥羔羊的效率比较

根据在播种红豆草二茬草地上所做不同放牧管理(轮牧与定牧)加补饲(补饲与不补饲精料)方式育肥羔羊的试睑,对牧草产量、动物生产性能及生物学效率进行了比较分析。结果表明,轮牧比定牧增产11.68％,生物学效率可提高26～54％。在轮牧基础上后期补饲部分精料可增产18.23％(P<0.05)。实行本试验所进行的即使是不完全的季节畜牧业,亦比非季节畜牧业生产增产约4倍。从而验证了草地农业生态系统的效益放大原则。

Efficiency of Lamb Fattening by Different Feeding Systems in Sainfoin Stubble Fields

An experiment of fattening lambs in Sainfoin (Onobrychis viciifolia Scop.) stubble fields with four treatments of rotational grazing (R), continuous grazing(C), with supplements(S) and without supplements (W), was conducted at the Herbage Station of Gansu Agricultural University in 1988. The performance of lamb production and biological efficiencies was analysed in view of energetics to see the validity of grassland farming system. Results showed that the average growth rate of treatment R was 11.68% greater than C; the conversion rates, including DM, CP and CE, of treatment R were 26～54% higher than C; the ratio of energy output to input for supplements under treatment R was 24% higher than C. Mean while the treatment S was superior to W in the later stage of fattening. And also, the results indicated that the reversed Pyramid law of energy conversion in grassland farming system exists and the ecological efficiency could be amplified obviously.