用约束最大似然法(REML)估计纯种与杂种蛋鸡饲料利用率及其相关性状的遗传参数,材料源于一个正反反复选择(RRS)品种洛岛红和浅花苏......

用施氏鲟同西伯利亚鲟和小体鲟进行正反杂交试验,比较3种鲟鱼纯种及杂交种后代连续两年的育苗指标得出如下结论：杂交种后代同大部分......

Purebred microorganisms were employed to upgrade the fermentation process of Zhejiang rosy vinegar. The fermentation cyc......