Rumpless chickens are characterised by caudal dysplasia, the absence of the pygostyle or caudal appendage – the "parson's nose". This is the result of inheritance of an autosomal dominant trait. The mutation which causes it is unknown; two candidates have been proposed.
The Braekel or Brakel is a traditional Belgian breed of chicken. It is thought to have originated in the area of Brakel, in the Flemish province of East Flanders, for which it is named. There is a bantam version of the Braekel. The Campine of the United Kingdom derives from it.
The Orpington is a British breed of chicken. It was bred in the late nineteenth century by William Cook of Orpington, at that time in Kent in south-east England. It was intended to be a dual-purpose breed, to be reared both for eggs and for meat, but soon became exclusively a show bird. The Australorp of Australia derives from it.
The Cochin is a breed of large domestic chicken. It derives from large feather-legged chickens brought from China to Europe and North America in the 1840s and 1850s. It is reared principally for exhibition. It was formerly known as Cochin-China.
The Japanese Bantam or Chabo is a Japanese breed of ornamental chicken. It is a true bantam breed, meaning that it has no large fowl counterpart. It characterised by very short legs – the result of hereditary chondrodystrophy – and a large upright tail that reaches much higher than the head of the bird.
The Houdan or Poule de Houdan is an old French breed of domestic chicken. It is named for its area of origin, the commune of Houdan, in the département of Yvelines to the west of Paris. It belongs to the crested chicken group, is muffed and bearded, has an unusual leaf-shaped comb, and has five toes on each foot rather than the usual four.
The Booted Bantam or Dutch Booted Bantam is a European breed of true bantam chicken. It is characterised by abundant feathering on the feet and shanks, which gives it a "booted" appearance; and by vulture hocks, long stiff downward-pointing feathers on backs of the thighs, from which the Dutch name Sabelpoot ("sabre-legged") derives.
The Barbu d'Everberg, is a Belgian breed of bantam chicken. It is a tailless variant of the Barbu d'Uccle, and was bred in about 1906 at the Château d'Everberg, at Everberg in the municipality of Kortenberg, between Brussels and Leuven. It is among the most endangered chicken breeds in Belgium, and in 2010 its conservation status was classed as "critical". It is a true bantam, with no large counterpart. Cocks weigh 700–800 grams, and hens 550–650 g.
The Barbu d'Anvers, Dutch: Antwerpse baardkriel, is a breed of bantam chicken from Belgium. It is a true bantam, and has no full-sized counterpart; males weigh about 700 grams and hens about 600 g. The Barbu d'Anvers is one of the oldest bantam breeds, and is thought to have originated in the province of Antwerp in northern Flanders. It is the only Belgian bantam breed not threatened with extinction. In the United States it may be called the Antwerp Belgian or Belgian Bearded d'Anvers.
The Barbu de Watermael, Dutch: Watermaalse Baardkriel, is a Belgian breed of bantam chicken. It originated in the Belgian town of Watermael-Boitsfort, from which it takes its name, which means "bearded [chicken] from Watermael". It is closely related to the Barbu d'Anvers, but is distinguished from it by its small, backswept crest of feathers as well as its triple spiked rosecomb. The Barbu de Boitsfort is a rumpless variation, the only difference being that it lacks the uropygium, the part of the anatomy that carries the tail.
Lavender or self-blue refers to a plumage color pattern in the chicken characterized by a uniform, pale bluish grey color across all feathers. The distinctive color is caused by the action of an autosomal recessive gene, commonly designated as "lav", which reduces the expression of eumelanin and phaeomelanin so that black areas of the plumage appear pale grey instead, and red areas appear a pale buff.
The Barbu de Grubbe, Dutch: Grubbe baardkriel, is a Belgian breed of bantam chicken. It is a true bantam, and has no full-sized counterpart; males weigh about 700 grams and hens about 600 g. It is a tail-less variant of the Barbu d'Anvers, and is otherwise similar to it in every respect. The same colour varieties are accepted for the Barbu de Grubbe as for the Barbu d'Anvers.
The Belgian Bantam, Dutch: Belgisch kriel, French: Naine belge, is a breed of bantam chicken from Belgium. It is a true bantam, and has no full-sized counterpart; cocks weigh about 650 grams and hens about 550 g. It is in danger of extinction; in 2010 a total of 168 birds were counted in the whole of Belgium. Fourteen colour patterns are recognised in the European standard.
The Ardennaise, French: Poule ardennaise, is a breed of domestic chicken from the Ardennes plateau, in Belgium and eastern France. Its range extends from the Pays de Herve in Wallonia to the French département of Ardennes, and includes the Fagnes, the Famenne, and the valleys of the Amblève, the Ourthe and the Semois.
The Barbu de Boitsfort or Dutch: Bosvoordse Baardkriel is a breed of true bantam from Belgium. It is a tail-less variety of the Barbu de Watermael, and is otherwise similar to it in every respect. It is named for the commune of Watermael-Boitsfort in the Brussels region of Belgium.
The Bassette Liégeoise or Bassette is a breed of large bantam chicken from Belgium. It is larger than most bantams, but much smaller than full-sized breeds; cocks weigh about 1000 grams and hens about 900 g. Like most Belgian bantam breeds, it is in danger of extinction. Eighteen colour patterns are officially recognised; many of them are rare.
The Pictave is an endangered French breed of bantam chicken. It is named for the Pictavi, the tribe which gave its name to the former Province of Poitou, now part of the region of Nouvelle-Aquitaine. It is a true bantam, and has no full-sized counterpart; it is the only true bantam of France. Cocks weigh about 800 grams and hens about 600 g. It was created in the twentieth century by Raymond Lecointre, who used the hens to incubate his pheasant eggs and raise the chicks.
The Malines, Dutch: Mechelse Koekoek, is a Belgian breed of large domestic chicken. It originates from the area of Mechelen, in the province of Antwerp in Flanders, for which it is named. It was created in the nineteenth century by cross-breeding local cuckoo-patterned farm chickens with various different types of imported Oriental chicken. With the Jersey Giant, it is among the heaviest of all chicken breeds. It is valued for the quality of its meat, which is pale in colour and fine-textured.
The Niederrheiner is a German breed of chicken. It is named for the Niederrhein or Lower Rhine region where it originated in the early twentieth century, and derives principally from the Dutch North Holland Blue meat chicken. It was recognized in Germany in 1943. In the twenty-first century it is an endangered breed.
