when the objection of conservation is fixed,the best quantities of male and female is 2m2N-m1m2NNe2m2 and 14m2NNem2(random select stud animal)or and(same quantity select stud animal among families).

• 保种目标确定时为2m2N-2m m21m2NNe和41mm2N2Ne(随机留种)或4m2N-m42mm22+2m2NNe和14m1NNem(各家系等数留种)。