Eggshell Quality

Topics: Chicken, Eggshell, Eggs Pages: 8 (2498 words) Published: April 24, 2011

The purpose of this project is to determine whether different brands of caged or free-range hen eggs have stronger shells. This project will prove whether caged or free-range hen eggshells are stronger.

My hypothesis for this project is that free-range hen eggshells, in all of different brands are stronger than caged hen eggshells. I choose free-range eggshells, because their diet and lifestyle would be different from caged eggs.

* 24 Free-range hen eggs (3 different brands)
* 24 Caged hen eggs (3 different brands)
* 5 identical bottle lids
* 1 wooden plate
* Weights (I will be using canned soup, corn, books)
* 1 Scale
* 1 Timer
* 1 30cm ruler
* 1 stool
* 1 table

Independent Variable: Egg brand, egg shell thickness, egg shell strength, egg size Dependent Variable: The time it takes for the egg shell to crack. Variables you need to keep constant: The weights I’m putting onto the eggs, the lengths the eggs are away from each other.


The control of my project would be the egg brand, because I would compare the results of each brand with one another.

Before the experiment: Conduct this quick experiment to get a background understanding, as well as to back your final experiment and report up. 1. Crack 2 free-range, and caged-eggs.
2. Compare the egg shells, and the rigid lines of the crack. Take notes on it. 3. Initiate on working on the actual experiment.
Actual experiment:
1. Measure all the weights, wooden tray (only one, the tray on the bottom does not count) and eggs first. 2. Put a stool on the ground (on top of a table), and then lay 5 bottle lids on top of it, to form a square shape. Make sure you measure the lids, so that they are 7.5 cm apart. 3. Put 5 eggs vertically on top of the lids.

4. Put another wooden tray on top of the lids.
5. Carefully stack each weight on top of the wooden tray, whilst timing and recording how much weight you have put on top of the eggs. 6. Record how long it takes for the eggs to start cracking, until at least one collapses. And how much weight you have put onto the eggs. 7. Repeat for free-range (and caged) eggs 3 more times, to get accurate result. Above: What the stacked result should look like.


Measurements for cracking the egg shells will be made with a digital timer, to ensure its accuracy. The distance of the eggs’ will be placed and measured with a ruler and recorded - to make sure it does not affect the results. Once a cracking sound occurs, I will record it but keep adding the weights until at least one breaks. Once they all break, I will record the final time and weight. Afterwards, I will graph up the measurements.


Make sure you conduct the experiment in an area on a flat surface because once the eggs collapses, all the weights will fall off. This is why I conducted the experiment on a small stool with a flat surface, on top of a table.


23/2/2010| Started off researching as to what sort of project I should do. Chosen topic ended up as finding out which egg shell strength (free-range or caged eggs) is better.| 10/3/2010| Went and looked up some information on the internet and in my old science magazines for information. Gathered 2 very useful sources. One from professors, and the other from Science Illustrated.| 17/3/2010| Discussed about how I should conduct my experiment, and asked my parents for their opinions.| 24/3/2010| Went out and bought the eggs. Then did ‘before the experiment.’ Recorded everything.| 15/4/2010| Conducted the actual experiment, recorded everything.| 7/5/2010| Graphed the results.|

9/5/2010| Wrote the report, double checked everything.|



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