breeding gain

But only enlarge population size, it will decrease breeding efficiency and population multiple breeding gain, we should enlarge breeding flock size and active breeding flock proportion in practice. 5.

育种投入平均减少22.97%，但单一加大群体规模，随着留种公羊数的增加，将降低育种效益和综合遗传进展，在育种实践中应尽量扩大育种群规模和主动育种群比例。

The mean generation interval of the population is 4.176 years and the total breeding gain is 63.198 Yuan.

平均世代间隔为4.176年。

The population multiple breeding gain, and breeding profit will reach to 18.631 Yuan RMB and 375.569 Yuan RMB respectively, it will increase 36.83% and 153.41% respectively compared with current breeding scheme of 13.616 Yuan RMB and 148.208 Yuan RMB. 6.

达到最优状态时超细型细毛羊群体综合育种进展和育种效益可达到每母羊每年18.631元和375.569元，比现行育种方案的13.616元和148.208元分别提高了36.83%和153.41%。

Conclusion: Getting rid of alabastrums in breeding season we will gain hige-grade and high-yield medicinal herb.

结论：生育期内除去花蕾，才能获得优质高产药材。

When proportion of breeding flock size is fixed, the population size enlarge every 5000, breeding profit and genetic gain will roughly increase 7.21% and 6.60% respectively, and breeding cost will decrease 22.97%.

在育种群规模比例固定的情况下，群体规模每扩大5000只，育种效益平均增加7.21%，遗传进展平均增加6.60%。

Excellent clones are selected for Beijing, through the economical weights analysis and index selection of industrial timber properties such as volume increment, timber total density, fiber length and stem straightness. The comprehensive breeding gain of industrial timber can be higher than 20%.

经过材积生长量、木材全年密度、纤维长度、主干通直度性状经济权重分析和指数选择，为北京点选出8个优良无性系，平均综合育种增益达20%以上。

Strict and blocked production management system is modernization swine breeding companies gain benefits'basis, the display of well management and actual capacity is the key of win the market. They couple get a spacious prospect to TV monitor in the usage of the modernization swine breeding companies.

严格封闭的生产管理体系是现代化养猪企业获得效益的基础，良好的企业管理及实力展示又是赢得市场的关键，二者结合使用电视监控在现代化养猪企业中的应用具有广阔的前景。