Liu Wen-Zhong
College of Animal Science and Technology, Shanxi Agricultural University, Taigu 030801, China.
Yi Chuan. 2009 Aug;31(8):791-8. doi: 10.3724/sp.j.1005.2009.00791.
A composite population is a breed made up of two or more component breeds and designed to benefit from hybrid vigor without crossing with other breeds, and is thus regarded as an alternative method for heterosis utilization. The breeding effects depend on retained heterosis in livestock composites. This paper reviews prediction methods of retained heterosis, relative production efficiency and production performance, and evaluation methods of breeding effects of composite populations. A composite population contains all three types of heterosis. If inbreeding can be avoided, it can retain heterosis to a certain extent. The retained heterosis depends on the number of contributing breeds and their proportions in the composite. The production performance rests both on average breeding values of contributing breeds and on retained heterosis of the composite itself. Breeding effects of composite population can be evaluated by theoretical prediction, actual estimation of retained heterosis, examination of genetic variation and/or comparison with other relevant breeds.
合成群体是由两个或更多个组成品种构成的品种，旨在在不与其他品种杂交的情况下从杂种优势中获益，因此被视为杂种优势利用的一种替代方法。育种效果取决于家畜合成群体中保留的杂种优势。本文综述了保留杂种优势、相对生产效率和生产性能的预测方法，以及合成群体育种效果的评估方法。合成群体包含所有三种类型的杂种优势。如果能够避免近亲繁殖，它可以在一定程度上保留杂种优势。保留的杂种优势取决于参与合成的品种数量及其在合成群体中的比例。生产性能既取决于参与合成的品种的平均育种值，也取决于合成群体本身保留的杂种优势。合成群体的育种效果可以通过理论预测、保留杂种优势的实际估计、遗传变异检测和/或与其他相关品种比较来评估。
