一个雄亲与数个雌亲相配所组成的家系是一个“全同胞——半同胞”混合的家系。雌亲内的后代是全同胞,雌亲间的后代是半同胞,这样一个家系内的亲缘相关随着配种的雌亲数和每个雌亲的后代数量的不同而变化。本文提出了计算这种混合家系亲缘相关的一个近似公式,并证明即使是对后代作随机抽样的情况下也是适用的。 A matriarchal family composed of several females is a “all-sib-half-sib” mixed family. The descendants in the female parent are all sibs and the offspring among the female relatives are half sibs. The kinship in such a family varies with the number of breeding females and the number of progeny of each female. This paper presents an approximate formula for calculating the kinship of this mixed family and proves that it is applicable even in the case of random sampling of future generations.