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Older hens gradually produce fewer eggs, and the eggs are usually larger. [1] Since the average lifespan of a pet layer hen is 8–15 years, [2] henopause has received attention as a potential problem for backyard or urban chicken farmers who are eventually faced with the decision to either slaughter older layers or keep them as non-producing pets.
Commercial hens usually begin laying eggs at 16–20 weeks of age, although production gradually declines soon after from approximately 25 weeks of age. [2] This means that in many countries, by approximately 72 weeks of age, flocks are considered economically unviable and are slaughtered after approximately 12 months of egg production, [3] although chickens will naturally live for 6 or more ...
They can start producing eggs when they are 16 weeks old. [9] Golden Comet hens are productive until they reach the age of approximately two years. Beyond that point, their egg production gradually declines, and by around the third year, egg laying may cease, sometimes even earlier. Therefore they have a short production lifespan.
Red shaver hens can lay from 305 to 315 eggs a year, [3] and are reported to be prolific producers of large brown eggs. One four-year-old Red Shaver chicken in Ottawa was credited with laying an egg with a mass of 143 grams, which is almost three times the size of a standard medium egg (Typically a medium egg is 49 g, a jumbo egg is 70 g).
The Lohmann Brown is a brown variety of chicken, specifically bred for egg-laying purposes. It is a crossbred line [1] and is selectively bred from lines of the Rhode Island breed. [2] They start to lay eggs at about 19 weeks and produce up to 320 eggs up to an age of 72 weeks (one year production).
Chickens farmed primarily for eggs are called layer hens. The UK alone consumes more than 34 million eggs per day. [84] Hens of some breeds can produce over 300 eggs per year; the highest authenticated rate of egg laying is 371 eggs in 364 days. [85]
The Gramapriya starts laying eggs at an age of 175 days. In 72 weeks a Gramapriya chicken can lay 200–225. [2] [3] Gramapriya is a crossbred chicken developed by the Indian Government through a Hyderabad-based project under an All India Co-ordinated Research Project. Gramapriya chickens have been developed for backyard rearing.
A new record was set when a hen laid 364 eggs in 365 days. [16] They are also known to be good nest sitters and mothers, making them one of the most popular large heritage utility breeds of chicken. Hens lay approximately 190 light brown eggs per year, with an average weight of 55 g ; [ 17 ] : 11 bantam hens lay some 160 per year, averaging 40 ...