Nihon Yoton Gakkaishi
Online ISSN : 1881-655X
Print ISSN : 0913-882X
ISSN-L : 0913-882X
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Volume 58, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • A Novel Indicator for Evaluating the Change of Genetic Composition of a Developed Pig Strain
    Takeshi HONDA, Kenji OYAMA, Masahiro SATO
    2021 Volume 58 Issue 3 Pages 125-133
    Published: September 21, 2021
    Released on J-STAGE: January 06, 2022
    DOIhttps://doi.org/10.5938/youton.58.3_125
    JOURNAL FREE ACCESS
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    A pig population approved to be a strain after genetic improvement (developed pig strain) is usually managed so as to keep its genetic composition unchanged. The extent to which its genetic composition varies as the generation proceeds is currently evaluated by an indicator called coefficient of variation of genetic contributions (CVGC). In this study, we proposed three novel indicators (dexp, ddrift and dnew) as an alternative to CVGC. dexp and ddrift is derived by considering the developed pig strain as an founders of the pedigree. We theoretically showed that the latter indicator is superior to the former, because the former accounts for genetic composition of the current population only by genetic contributions of founder animals, but the latter further takes into account the effect of genetic drift generated after genetic improvement. Because dnew is derived by considering base population as an founders of the pedigree, and it accounts for genetic composition of the developed pig strain by making use of pedigree information during the period of genetic improvement, it is superior to ddrift, especially in situation where population size is reducing or expanding. At the end of this paper, we expressed our view on CVGC.

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