Chickens in Battery farms are bred to lay many eggs during their lifetime. 250 to 300 per year and they are kept for two years. Expect about 600 eggs from a battery or factory farm chicken.
Absolutely yes. A hen does not need a rooster to produce eggs, she only produces fertile eggs when a rooster is involved. Many farm flocks do not have a rooster among the flock and egg production does not suffer in the slightest. A rooster job is to protect the flock and mate with the hens to produce offspring but the hens will continue to lay eggs with or without him.
You want your hens are to the age of laying eggs (which is about 6 months), and your hens are under the age of three years (because when they reach this age, they are past their prime, and lay less eggs). Expect from your hens that every day 80% of the number of hens will be your number of eggs. So with this math, if you have 60 hens that are all in their prime, you can expect to get about 1344 eggs in four weeks.
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Warren hens are known for laying large brown eggs. These hens lay an average of 4 eggs each week. After a full two years of laying the amount of eggs that the hen produces will be reduced.
good question -2
The hens in many egg producing factories are kept in tiny cages, just a bit bigger than a car battery, thus the name.
A rooster in the hen house is not going to make the hens lay more eggs. If a farmer is wanting to have more chickens, then a select few hens can be put with a rooster for awhile to produce eggs that will actually hatch into baby chicks.
Four hens have the potential to lay four eggs but this is not always the case. Old hens will eventually stop laying eggs, sick hens may not lay any eggs and hens even in prime condition may be molting or may just be a slow laying breed. There are many reasons why four hens may not even lay one egg in a single day.
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