The wild ancestor of our highly domesticated chicken would produce a clutch of perhaps six eggs a year. On top of that, even the best egg-laying chicken breed won’t be able to produce 365 eggs a year. Actually, how many eggs a chicken lays a year depends on a lot of things, but especially on the breed of your chicken and her age. The English tried to breed a larger, dual-purpose bird, but Leghorns are still too skinny to be a good meat bird. "The typical interval between eggs laid is about 25 hours, so a hen that lays an egg every day will lay a bit later each day." Different breeds of hen will tend to give you different numbers of eggs. She is a Maran, a laying breed. Sumatras may lay 50 or fewer. They also have one of the best feed to egg conversion of all chickens… The record is somewhere over 300, my memory isn’t so good but I think it was close to 320. To decide the perfect chicken flock size, let’s take a realistic view of your needs, and then we will look at all the other factors that one can easily miss. A chicken’s first year of laying eggs is always their best. Young Cochins may lay only 100 or so. Personally, I think it’s time we left the poor chickens alone and let data answer a question for once: Just how many eggs can a chicken lay in a year? She is moulting a bit and will now rest until January. This does not mean that she will lay 365 days a year. Their diet, age and access to daylight are all important. The egg laying gradually tails off to a stop around now. It’s a sad fact of life that older chickens just don’t lay as many eggs as younger chickens. Our breeding for egg production over hundreds of years means the birds available today can lay between 100 and 350 eggs a year depending on the breed. Lets face it, we all want eggs from our chickens but there are a number of factors that affect the number of eggs a chicken lays.The breed characteristics are a starting point, some, such as show strains of Orpingtons lay as few as 80 eggs per year and others like for example a … This is slightly less than one a day, and work out to about 350 a year. She came into lay in January about a month after December 21st when the days start to get longer. Simply put, “rate of lay” means how many eggs a chicken will produce in a period of time, usually the first year of actual laying. They lay about 4 eggs a week all year long. For instance, young Leghorns may lay 300 eggs per year. Age. Many things can affect how many eggs a chicken lays. Most hens lay between 3 and 5 eggs a week. A commercial White Leghorn laying 335 eggs in her first laying year is at a rate of 92% (335 eggs divided by 365 days). 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