| Summary: | 碩士 === 國立中興大學 === 動物科學系所 === 97 === The modern chicken has been considerably changed in the ability of meat and egg production was get higher and more various appearances than the ancestors. Therefore, chicken has a higher genetic variation which is the best material for genetic research. Silky fowl (SF) is a breed of chicken originated from China. They have a crest of feathers on the top of the head, turquoise earlobe, beard and muff, polydactyly, walnut comb, black skin, black muscle, black bone and ptilopody. They also have fluffy feathers so that their name comes from. The purpose of this study was to investigate the hereditary model for the ten special characters in the Silkie. One silky male from LRI mated with four L2 females to produce 86 F1 offspring. Then, four F1 males and 24 F1 females were used to generate 472 F2 in four hatches by half-sib mating. All F1 offspring had the same feather color and feather pattern as L2 strain and over 95％ had black skin, black bone, black muscle, turquoise earlobes, polydactyly and crest. The F2 generation showed segregation in phenotype. Chi-square test indicated that polydactyly and rose comb, were controlled by a complete dominant autosomal gene, fibromelanin and crest were controlled by a incomplete dominant autosomal gene, the silky feather and white feather color are controlled by a single autosomal recessive genes. The results of the skin L*a*b* value of two generation at 25wk showed the b* value of female was significantly higher (p＜0.05) than male and F2 had a lower L* value than F1. The pigment was not evenly distributed on the internal organs. According to this study, it indicated all special phenotypes in the Silkies follow Mendelian inheritance law except the feathered shank, which maybe controlled by polygene.
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