On Sat, 28 Apr 2007 16:20:16 -0700, Val Krem <valkrem@YAHOO.COM> wrote:

>I would like to simulate the following data structure. > > For the first year I have 10 males and each male is mated to 100 female and produced 40 progeny per mate. Assume 50:50 sex ratio. Only on females performance was recorded (say egg production). > > For next year, based on female performance, select the top 10% of males to be the parent for next generation. > > Again in the second year, each selected male is mated to 100 females and producing 40 offspring per mate. The program continues for five years. > > I would appreciate your help to simulate this kind of data structure. > > Thanks in advance >Val

I think more specifications are needed: initial female population; determination/distribution of the performance measure; whether breeding involves all age cohorts or only some age range; maybe more.