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Topic Real-life DOE: Chicken and Eggs

Real-life DOE: Chicken and Eggs

Home Forums General Forums Implementation Real-life DOE: Chicken and Eggs

This topic contains 4 replies, has 5 voices, and was last updated by  Sergey 11 months, 3 weeks ago.

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  • #643027 Reply


    For fun and to teach my Daughters there is more to life than the internet I bought some chickens. I am totally new to this so I am full of questions. One of my question is that I have 4 chickens that average 3 eggs a day for the past 30 days. Only two times have the chickens laid 2 eggs. The rest of the 28 days they laid 3 eggs. Never 4 and never 0. My friend told me this is the way chickens do during the summer. But my question to this forum is; What is the possibility that only 3 out of the 4 chickens are producing eggs? Also how could that be calculated.

    I know that I can put each chicken in a separate area to discover if one is not laying eggs. This question is to help expand my Six Sigma Tool box. If possible I would love to show my girls a real life DOE.

    #643202 Reply

    From the net we have this item:

    “A hen can lay only one egg in a day and will have some days when it does not lay an egg at all. The reasons for this laying schedule relate to the hen reproductive system. A hen’s body begins forming an egg shortly after the previous egg is laid, and it takes 26 hours for an egg to form fully.”

    Based on the above, your issue is probably one due to the time differences for each hen with respect to their reproductive cycle and I have no idea how you would go about determining that other than isolating the hens and identifying the time of an egg drop for each hen. Knowing that value for each hen and assuming the internet statement of 26 hours is correct you could work out the time overlaps and determine the cycles for the daily occurrence of 2,3, and 4 eggs. Not an experimental design but certainly an exercise in probability and prediction.

    #646063 Reply

    You would have to find something to measure and something to vary. Number of eggs per day could be a Y variable, but due to the low counts and low variation, it’ll likely reek havoc on your analysis. Plus you would have to decide what to vary.

    Now, you could use time between delivery as a Y variable and then have your daughters decide what to change in order to “increase production.” But having had good home-farm fresh eggs, I’m not inclined to want to experiment with biological rhythms.

    Another Y variable might be the hardness of the shell. As you may have discovered, one needs to supplement a chicken’s diet with calcium and there are a number of ways to do that. Your children could experiment with a factor of calcium supplement and have levels of “no supplement”, “store bought”, and “oyster shells” (or whatever you would like). Any other “well what about…” items could also be factors or blocks. The chickens could be a collective community or blocks. It would probably take a few days or a week to give the supplement enough time to work. – – This could also lead to interesting residual analysis.

    The Y variable (hardness) could be measured a number of ways. I had seen it done in a home lab once by putting the item on a scale, zeroing the scale, and applying pressure until the item broke. You can do this with the whole egg, or a conical end of an empty shell (I’d also recommend video taping the scale display in case someone blinks while collecting data. Or you can measure shell thickness with a micrometer.

    Good luck.

    #646200 Reply

    You may not need to get in to analysis if you have chicken wise date wise data on No of eggs….that would be easy to infer something…

    #647240 Reply

    I see some ideas about experiment. But what about design of experiments in here? Are there any hypothesis?

    This is a common mistake to jump from no data to DOE. In between there are a lot of work to do…

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