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Leghorns are good layers of white eggs, laying an average of 280 per year and sometimes reaching 300–320, with a weight of at least 55 g. [6] White Leghorns have been much used to create highly productive egg-laying hybrids for commercial and industrial operations. [11]: 161
Meat chickens, commonly called broilers, are floor-raised on litter such as wood shavings, peanut shells, and rice hulls, indoors in climate-controlled housing. Under modern farming methods, meat chickens reared indoors reach slaughter weight at 5 to 9 weeks of age, as they have been selectively bred to do so. In the first week of a broiler's ...
One indication of the effect of broilers' rapid growth rate on welfare is a comparison of the usual mortality rate for standard broiler chickens (1% per week) with that for slower-growing broiler chickens (0.25% per week) and with young laying hens (0.14% per week); the mortality rate of the fast-growing broilers is seven times the rate of ...
For hens used in egg production in the US, as of 2011 the FCR was about 2, with each hen laying about 330 eggs per year. [25] When slaughtered, the world average layer flock as of 2013 yields a carcass FCR of 4.2, still much better than the average backyard chicken flock (FCR 9.2 for eggs, 14.6 for carcass). [26]
The Ancona is a good layer of white eggs, of which it lays an average of 220 per year; [6] the eggs weigh 50 g (1.8 oz) or more. [4] Hens have little tendency to broodiness; pullets may begin to lay at 5 months. [citation needed]
Broiler breeder farms raise parent stock which produce fertilized eggs. A broiler hatching egg is never sold at stores and is not meant for human consumption. [9] The males and females are separate genetic lines or breeds, so that each line can be selected for optimal traits for productivity in either females or males, rather than a single line in which a compromise is reached between female ...
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 g in weight. [18]: 10
RSPCA standards state that in order for chickens to be free range, there must not be more than 13 chickens per square meter. [23] Free-range broiler systems use slower-growing breeds of chicken to improve welfare, meaning they reach slaughter weight at 16 weeks of age rather than 5–6 weeks of age in standard rearing systems.
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