90/10 Rule
I have just responded to the Cracked Corn article today. They quote the 90/10 rule when providing treats to chickens. I thought that perhaps a visualization of what that means might be useful.
Here is a bit of a copy of what I posted.
Chicken feed rates are most commonly expressed in studies as weight or mass not volume. Most of these studies were done to measure the delivery of antibiotics in feed. Despite that they do give a starting point to determine how much your chicken eats per day.
If we use a study done by B.B. Buck in 1985 they categorized feed consumption as a % of body weight.
So if we look at a 3.5 lb chicken, say a Polish or a Leghorn hen, they consumed 6.7% of their weight by day in feed. Let's convert lbs to ounces in order to make determining 10% easier. 3.5 lbs × 16 = 56 oz x 6.7% = 3.752 ounces of feed per day. That is about 3/4 of a cup.
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10% of that would be 0.3752 oz of corn or no more than a palm-full per day.
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Let's look at a bigger chicken, your typical layer. Not a dual purpose bird like an orpington, just a standard hen say around 5 lbs. In the study, a 5.5 lb chicken consumed 5.0% of their body weight. 5.5 lbs × 16 = 88 oz x 5.0% = 4.4 oz feed per day. That is approaching a cup of feed.
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10% of that is 0.44 oz of corn or again, no more than a palm-full per day.
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As you can see despite increasing the size of the chicken, it is still about a palm-full of corn per day.
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sorry your ankle is acting up, take it easy, and be careful 
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