我的经纪人生了太多的孩子

Question

我正在研究一个模型，其中存在后代的有性繁殖，所以有两种代理类型，男性和女性。我要求代理在达到一定的年龄后进行繁殖: 400次刻度，并继续每400次刻度这样做。

如果有男性的话，女性应该只生一个孩子。该模型适用于最初的几代人，但随后人口呈爆炸式增长。一名女性和一名男性的起始人口顺序如下: 2，3，7，19,575。我不知道为什么它突然从19增加到575。

看起来有些雌性后代在出生后立即繁殖，尽管它们有一个age = 0，也就是说它们没有遵循这个命令：

 ask females [
        if  age > 0 and age mod 400  = 0 [
      reproduce
        ] 

下面是完整的模型：

turtles-own [age]

breed[males male]
breed[females female]

females-own [ mates max-mate-count mate-count availa-males mother father]


to setup
  clear-all

    crt 2 [
    ifelse random 2 = 1 [set breed males] [set breed females]
  ]
  ask females [set color grey
    setxy random-xcor random-ycor
  ]

  ask males [set color red
    setxy random-xcor random-ycor
  ]

      reset-ticks
end

to go 

  ask turtles [increment-age]

  ask females [
    if  age > 0 and age mod 400  = 0 [
    choose-mates
  ]
  ]

 ask females [
    if  age > 0 and age mod 400  = 0 [
  reproduce
    ]
  ]


  tick
end

to increment-age
  set age (1 + age)
end

to choose-mates 

  ask females   [
    set mates males in-radius 100 with [age >= 400]
  ]
end


to reproduce 
    ask females with [count mates > 0 ]  [
    hatch 1  [
    set mother myself
    set father one-of [mates] of mother


      ifelse random 2 = 1 [set breed males
                          set color red
                        move-to one-of patches with [pcolor = black]
                        set age 0
                       ]

                        [set breed females
                         set color grey
                        move-to one-of patches with [pcolor = black]
                        set mate-count 0
                        set age 0

                        ]]]  
end 

希望你能帮上忙！