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http://dx.doi.org/10.5536/KJPS.2018.45.3.155

Study on the Characteristics of Feather Developing Pattern and Morphology in Early- and Late-Feathering Korean Native Chickens  

Bang, Min Hee (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
Cho, Eun Jung (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
Cho, Chang Yeon (Animal Genetic Resources Research Center, National Institute of Animal Science, RDA)
Sohn, Sea Hwan (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
Publication Information
Korean Journal of Poultry Science / v.45, no.3, 2018 , pp. 155-165 More about this Journal
Abstract
Chicken feathers could be classified into early-feathering (EF) and late-feathering (LF) depending on the development and patterns of the wing and tail feathers. Currently, feather-sexing is a widely used chick sexing method in the industry. This study was carried out to suggest the method of classifying of EF and LF chicks to establish auto-sexing Korean native chicken (KNC) strains. The development and morphology of wing feathers and tail feathers in 856 KNCs from hatching to 55-days old were analyzed to classify EF and LF chicks. We also performed PCR analysis using K-specific gene primers to confirm the agreement between the phenotypes and genotypes of EF and LF chickens. In the results, the EF chicks had long primaries and coverts, and there was a significant difference in length between primaries and coverts. The LF chicks had shorter primaries and coverts than the EF chicks, and showed little difference in the length between primaries and coverts. LF chicks could be classified into four groups: LF-Less, LF-Scant, LF-Equal and LF-Reverse according to their wing feather patterns. EF chicks had 1.5 times longer primaries than LF chicks until they were 15-days old, but the lengths were almost the same at 50-days old. The tail feathers of the EF chicks were apparent at 5-days old, but those of the LF chicks were short and indefinite at that time. When EF and LF chicks were classified by the length of primaries being more or less than 9 mm, the classification accuracies for EF and LF chicks were 96.2% and 85.4%, respectively, compared to the PCR results. In conclusion, juvenile EF and LF KNC showed distinct differences in feather development and morphology, and could be easily distinguished at one day-old.
Keywords
Korean native chicken; early-feathering chick; late-feathering chick; feather classification; feather-sexing;
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