兔生产系统中氮素转化效率的研究

研究由两个独立的分试验组成。试验1:肉兔生产中N素的流动及分配;试验2:兔毛生产系统中的N素转化效率。结果表明:兔摄入饲料N后,经消化,约占食入N 25.5％的N由粪中排出,经吸收代谢,有27.1％的N由尿排出体外,约占食入N 47.1％的N沉积在体内成为器官修补、组织增长和繁衍后代的贮备;日粮营养水平影响兔毛的生产效益,当兔采食消化能10 493.47KJ/kg,17.4％粗蛋白质日粮时,产毛效率为94.13,日均沉积在兔毛中的N占食入N的6.1％,占食入消化N 9.1％,产毛需耗料是增重耗料的10倍。可见,兔毛生产比兔肉生产更多地依赖于植物生产系统。

Conversion Efficiency of Nitrogen in Rabbit Production System

The two independent components of this study were:a) the flow and allocation of nitrogen in meat rabbit production, and b) the conversion efficiency of nitrogen in wool rabbit production. It was shown that out of the total intake of nitrogen 25. 5% and 27.1% were excreted through feces and urine, respectively, with 47. 1% retained in the body of rabbits. When the diet contained 10 493. 47 KJ digestible energy per kilogram and 17. 4% crude protein, the feed requirement for producing on kilogram wool was 94. 13 kilograms; the daily rate of nitrogen deposit in rabbit wool accounted for 6. 1 % of the daily nitrogen intake and 9.1% of the digestible nitrogen. The requirement of nitrogen for producing one gramme wool was about 10 times as high as the amount required for obtaining one gramme of body gain.