I have a book in my hands right now called "The Dollar Hen" by Milo M. Hastings. This book was written in the year 1909 -- a full one hundred years ago, and BEFORE commercial layer feed became available.
Agricultural specialists of the day did research to determine the average number of eggs that a healthy hen laid in a single year back then. They actually researched this by state, and the average number of eggs laid per hen is given in table form, broken down by state.
Back in these days -- back in the days before layer pellets were available to feed the chickens -- the average hen laid somewhere around 60 or 70 eggs in a year.
This differed depending on region of the country, however.
Surprisingly, the highest average number of eggs per hen was in the New England area. Maine hens laid the highest amount of eggs per hen to be found anywhere in the nation: 100. Other states with relatively high egg counts per hen included Massachusetts (96), New Hampshire (96), Vermont (94) and Connecticut (89).
The mid-west hens came in around the high 70's or low 80's.
California hens came in at an average 71 eggs per hen. Hens in the Salt Lake desert (Utah) actually provided more eggs per hen than California, averaging in at 77 eggs per hen.
Much to my surprise, hens in the southeast part of the country produced the least number of eggs per hen. Virginia hens didn't do too bad relative to birds in other sectors of the country (67 eggs per hen), however Louisiana hens ranked lowest in the nation at an average of only 40 eggs per hen. Georgia hens laid an average of 41 eggs per hen, while Mississippi hens laid 43 eggs per hen. Alabama hens laid an average of 48 eggs per hen.
We get far more eggs per hen now, compared to 1909 when he wrote the book.
There are three reasons for this:
1, Chicken breeders have deliberately bred the hens that were the best producers, thus over time developing chicken breeds that are heavy egg layers
2, We house chickens better today than chickens in at least some parts of the country were housed back in 1909. Actually, the reason he says that southern chickens produce so much fewer eggs than other areas of the country is because of housing -- southern chickens had either very poor housing or did not have housing at all, but slept in the trees at night. Chickens in the north had to be penned up in warm facilities or else they would die, and he argues that their better housing conditions is why the more north a chicken lived, the higher her average yearly egg production would be.
and, germain to the question asked in this thread,
3, Our chickens eat better today than they did back in 1909.
In 1909, there was no such thing as layer pellets. A common diet for a chicken, according to Hastings, consisted of: oyster shells, beef scraps, corn and one other type of grain, together with an abundance of green pastureland or green feed.
Note that even the best housed of our nation's chickens (those of the northeast) failed to lay over an average 100 eggs per year. That's only about one egg every 3 and 1/2 days. My lightest layers: the 2 year old laying hens, lay 3 eggs per week. My young hens (less than a year old) lay as much as 6 eggs per week, and one lady -- a production red -- has produced an egg every day this month except one day!
So the answer to the question asked by the person in post #1 is that although there are more factors that influence how many eggs a hen will lay than just simply what the birds were fed, their food most certainly has a great impact on how many eggs they lay.
If you want to maximize egg production, you probably need to feed your flock layer pellets.