【摘要】 随着中国养禽业的发展和疫苗生产的不断扩大，无特定病原（ＳＰＦ）鸡蛋的需求量也随着增加。为了提高生产力和市场竞争力，１９９５年初北京实验动物研究中心从美国引入了ＳＰＦ种蛋。其中母系１８００枚，父系２００枚。引入种蛋在一个完全独立的屏障系统中孵化和饲养，经两次微生物监测完全符合引种标准后解除隔离。新种群按照预先设计的保种方案，经几个世代的保种繁育，各项生产性能表现出高于或等于引入种群的生产性能。特别是产蛋率和受精率从引入种群的８３％和９３％提高到８５％和９８％。与中心原有种群（澳大利亚）相比，各项生产性能有了大幅度提高，经济效益明显提高。更多还原

【Abstract】 As enlargement of poultry industries, demand of SPF eggs has been increased quickly. 2 000 breeder eggs(l800 of female line and 200 of male line) were introduced from America in order to meet marketing requirements in 1995. New colony had been hatched and maintained in separated barrier system until completing animal health tests twice at 10 and 16 weeks old of chickens. After several generations, the production performances of new colony were much better than original data, particular in laying rate and fertility, from 83% and 93% to 85% and 98% separately.更多还原