Title: Cyclopedia of farm animals
Identifier: cyclopediaoffar00bail (find matches)
Year: 1922 (1920s)
Authors: Bailey, L. H. (Liberty Hyde), 1858-1954, ed
Subjects: Domestic animals; Animal products
Publisher: New York, Macmillan
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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tions are incompletely dominant over the less ad- vanced or rudimentary characters. Characters usu- ally showing incomplete dominance are marked by at- Characters Dominant condition Recessive condition Lateral elements No lateral ele- (in pea and rose) ments Cerebral closure. Perfect, plain skull Imperfect, hernia as in Houdan or Polish Present Absent Feather, form. . Typical, plain Embryonic, silky Feather, form . . Frizzled Plain Muff Present Absent Skin color . . . Pigmented, black Unpigmented Iris color.... Heavily pigmented, black Red Plumage color . Pigmented Albinic, white of silkies, etc. Plumage color . Gray-white of White Leghorn Pigmented Shafting .... Present Absent Penciling.... Present Absent Extra toes . . . fPresent Absent Booting .... fPresent Absent Egg pigment . . Present, brown Absent, white Broodiness . . . Sitting Non-sitting
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Combinations of characters. Ordinarily, the hybrid shows no new character but only a new combination of the parental char- acters. Occasionally, however, an apparent excep- tion makes its appearance. Thus, when a white and a black bird are mated, it sometimes happens that the hybrids have a blue plumage. This blue is really a fine mosaic of black and white and is best known in the race of poultry called Andalu- sian. When two blue birds are mated, however, they throw black and also white chicks as well as blue ones. The blacks and the whites are homo- zygous and the blues heterozygous again. Similarly, under cer- tain circumstances the crossing of a light and a dark bird may produce offspring with a barred plum- age ; and two such barred birds will throw light birds and dark birds again as well as barred birds. Again, if a single-combed fowl is crossed with one having two horns, as the Polish, the hybrid has a Y-shaped comb ; but in P2, the single and the paired combs reappear. In all these cases we have a heterozygous form due to the mosaic-like union of the two contrasted characters. The mosaic is not a permanent character but only the badge of impurity. Whether a heterozygous form can ever be fixed is a moot question. The barred condition Fig 530. The granddaughter, by in- breeding, of the Frizzled (Fig. 528) and the Silkie (Fig. 529) fowls. Show- ing how characters may be combined in the second hybrid generation.

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