The first color variety of Orpington was a Black Orpington bred by William Cook in England. Cockerel: A young rooster, under 1 year old. Both gonads (testes) are developed in a male chicken, whereas a female chicken has only one mature gonad (ovary). The testes are elliptical and light yellow. Boiler: A chicken 6 to 9 months old. Cook created this breed by crossing Plymouth Rocks, Minorcas, and Langshans; his end goal was to create a black bird to hide the soot of London. Normally, female chickens have just one functional ovary, on their left side. sexing sultan and polish. About Orpington Chickens. Cock: A male chicken, also called a rooster. It occurs in all industrialised egg production whether free range, organic, or battery cage.Worldwide, around 7 billion male chicks are culled per year in the egg industry. Hen: A female chicken. The Sebright has a mutation that converts male sex hormones into female sex hormones found in the tissue of their skin. The male chicken has two gonads (testes), located along the chicken’s back, near the top of the kidneys. Lyle Scheline is a professional chicken sexer, an expert of 22 years' experience. Over the past 100 years there have been many methods developed for how to tell the sex of baby chicks; some methods proved haphazard, some have proven quite effective. Another difference between the sexes involves sperm production versus egg production. Whether at the feed store choosing day-old chicks or hatching our own, all of us would probably enjoy knowing how to tell the sex of baby chicks to determine which are cockerels and which are pullets as soon as possible. In most breeds, the male and female chicken’s plumage has something which differentiates the sexes in the color either being a shade darker or lighter. Sultans are at the very height of ornamental oddity in the chicken world. From the right-hand side, Dr H. E. Schaef's chicken looked like any normal cockerel, with a bright red comb and a wattle. Again, the legs and feet of males are larger. Broiler: A cockerel of 2 or 3 pounds, at 8 to 12 weeks old. Eggs will be unfertilized if the hen has no access to a rooster, which means the egg will never develop into a chick. Fryer: A chicken of 3 to 4 pounds, at 12 to 14 weeks old. Chick culling or unwanted chick killing is the process of separating and disposing of unwanted (male and unhealthy female) chicks, for which the intensive animal farming industry has no use. In general, hens become mature enough to lay eggs around six months of age, though this varies by breed. Healthy female chickens, known as hens, are able to lay eggs, whether or not a rooster is present. 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