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KMID : 1025520120540050337
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Journal of Animal Science and Technology
2012 Volume.54 No. 5 p.337 ~ p.340
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Evaluation of the Degrees of Genetic Connectedness Among Duroc Breed Herds
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Cho Chung-Il
Choi Je-Gwan
Park Byoung-Ho
Kim Si-Dong
Kwon Oh-Sub
Choi You-Lim
Choy Yun-Ho
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Abstract
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The genetic connectedness between herds is an essential requirement to make robust across-herd estimation of the breeding values of the animals. In this study, genetic connectedness between herds was evaluated by a connectedness rating method. A total of 24,971 records of days to 90 kg (D90KG) of the pigs on performance testing programs collected from six herds (labeled from 'A' to 'F') of Duroc breed along with pedigree information comprising 456,697 families were used. Results showed that a total of eight boars were used for semen exchange programs among participant farms. Herds 'A' through 'E' were found strongly connected among them. But 'F' herd was genetically connected strongly only with 'A' herd. The highest average connectedness rating was 91.7% between 'A' herd and 'C' herd. The lowest average connectedness rating was 65.1% between 'D' and 'F'. The concept of a single genetic group comprising six Duroc herds studied is meaningful due to high connectedness rates among them. Therefore, with this high genetic ties between participant Duroc farms, the more accurate genetic evaluation would be possible.
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KEYWORD
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Connectedness rate, Across-herd genetic evaluation, Duroc, Pig
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