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Math Help - Fun graph pf the increasing population size of mice

  1. #1
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    Fun graph pf the increasing population size of mice

    I could really use some help on this one, as I cannot remember what this kind of equation is called or how it can be done.

    Here is the data I have inhand, which I am eventually trying to put into a chart in Excel.

    best case worst case
    reproduce litters 5 10
    sex ratio 2 3 females
    litter size 5 6
    gestation period 19 21 days
    female life 2 3 years

    female age to reproduce 4 weeks

    So, step one was breaking the time down to days.
    female life is 730 - 1095 days
    female age to reproduce 28 days

    By the "best / worst" at the top, I am trying to say the best case scenario (assuming we do not want a lot of mice), versus the worst case scenario.

    The calculation is where I am having trouble. Once the female is 28 days old, it will give birth to 5 to 6 pups, 2 or 3 of which are female. The gestation period is 19 - 21 days, so nothing can be produced during this point of time. When the offspring are born, the system begins again, 2 or 3 of those females become 28 days old, then begin to reproduce in the same manner. Of course each female needs to stop reproducing at 730 - 1095 days...

    I would not expect this to be viewable in one line, being that I gave a range of numbers, it would probably have to be two, but the calc should be the same.

    If someone could please help me with figuring out this calculation, which I then need to move into Excel and graph, it would be most appreciated. Also, can you tell me what this calc is called? I know I have done this before, but it has been a long time.

    Thank you so much,
    Ryan
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  2. #2
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    Re: Fun graph pf the increasing population size of mice

    Other fun facts that can be applied to this graph once it is created.... (kinda gross but that is the point)
    An average mouse weighs 15g
    Average mouse is 3.3 long
    Average mouse is approximately 1 tall
    In six months, a mouse can eat about 2 pounds of food and produce some 9,000 droppings
    Average dropping is long
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