Question: Where did the chicken which was part of cross breed for Legbar originate?

Context articles: Coucou de Rennes
Caldes rabbit
Leghorn chicken
Australorp
Black and Tan Virginia Foxhound
Chicken sandwich
Perlin (falconry)
Pekapoo
Laxton's Superb
Legbar

Coucou de Rennes is a French breed of chicken.
 The chicken was an historic Breton breed which had nearly disappeared by the late twentieth century.
 However following an effort at rebreeding, starting in 1988 that was carried out by the Ecomuseum of Rennes, the breed has since recovered.
 There is an association of Coucou de Rennes chicken producers that has breeding regulations.
 These state that the minimum age of slaughter must not be before 130 days for the fowl, 180 days for the hens and roosters, and 200 days for the capons.
The Caldes Rabbit is a Spanish breed of rabbit.
 It is a terminal sire used to cross breed with other rabbits for meat.
 They are primarily found in albino.
 These breed of rabbit usually weight 2.5-3.8 kgs This breed of rabbit are great with kids but really like to bite.
The Leghorn ( or ; Italian: Livorno or Livornese) is a breed of chicken originating in Tuscany, in central Italy.
 Birds were first exported to North America in 1828 from the port city of Livorno, on the western coast of Tuscany.
 They were initially called "Italians", but by 1865 the breed was known as "Leghorn", the traditional anglicisation of "Livorno".
 The breed was introduced to Britain from the United States in 1870.
 White Leghorns are commonly used as layer chickens in many countries of the world.
 Other Leghorn varieties are less common.
The Australorp is a chicken breed of Australian origin, developed as utility breed with a focus on egg laying.
 It achieved world-wide popularity in the 1920s after the breed broke numerous world records for number of eggs laid and has been a popular breed in the western world since.
 It is considered the honorary National Chicken Breed of Australia.
 The most popular colour of the breed is black, which is the only colour recognised in the United States of America, but blue and white are also recognised in its home country and the Poultry Club South Africa recognises buff, splash, wheaten laced and golden in addition.
The Black and Tan Virginia Foxhound is an American foxhound breed.
 It resulted of a cross breed with Bloodhounds in the 1700s.
 The breed was developed by the landed gentry in order to get a dog suitable for fox hunting.
 Besides the Black and Tan there are the Walker, Calhoun, Penn-Marydel, Goodman, July and Trigg, which all developed from similar crosses.
 The Black and Tan is believed to descend form hunting dogs imported to America by Robert Brooke in 1650.
 These hunting dogs were the ancestors of several varieties of American hounds and stayed with the Brooke family for more than 300 years.
 Afterwards French Foxhounds were bred in after George Washington received them as gifts from the Marquis de Lafayette.
 Much later, the breed's speed and stamina were improved introducing Irish Foxhounds.
In North America, a chicken sandwich is a sandwich which typically consists of a boneless, skinless breast of chicken served between slices of bread, on a bun, or on a roll.
 Variations of what North Americans consider a "Chicken Sandwich" include the chicken burger or chicken on a bun, hot chicken, and chicken salad sandwich.
 Countries outside of North America generally consider a chicken sandwich to only consist of flat bread, whereas a "chicken burger" is defined by the use of bread buns with chicken as part of its content.
The word perlin is a falconer's term for a cross breed of a peregrine falcon and a merlin.
 It is much bigger and faster than a merlin, but is not as big as a peregrine so the quarry it takes varies from larger songbirds to small game birds such as hen pheasant.
 It is less likely to fly as high as a peregrine and usually rings close to the falconer.
 As a rule, the peregrine is the father and the merlin is the mother.
Peekapoos are a cross breed between a Pekingese and a poodle.
 Like the parent breeds, Peekapoos can be friendly, affectionate dogs.
 Like poodles, they can be easy to train, and like other small breeds can live 12 to 15 years or older.
 Legitimate breed associations such as the AKC, the UKC, and the CKC, do not recognize the Peekapoo, or any other designer cross, as a breed.
The 'Laxton's Superb' is an apple cultivar that was developed in England in 1897.
 It is a cross breed between 'Wyken Pippin' and 'Cox's Orange Pippin'.
 It is a British apple with a green color and a dull red flush.
 It is a firm-textured dessert apple.
 The fruit is well known for its sweet and aromatic taste which is likened to the parent species it is derived from, the 'Cox's Orange Pippin'.
The Legbar is a rare British autosexing chicken breed.
 It was created in the early twentieth century by Reginald Crundall Punnett and Michael Pease at the Genetical Institute of Cambridge University.
 It was created by cross-breeding Barred Plymouth Rock chicken, Leghorns, Cambars, and in the case of "Cream Legbars", Araucanas.
 The Araucana blood in the "Cream Legbar" is reflected in its crest and blue to blue-green eggs.