Truncation Point in Truncation Selection for a Proportion-Defined Trait
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- SHOJO Masayuki
- Graduate School of Science and Technology, Niigata University
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- IWAISAKI Hiroaki
- Faculty of Agriculture, Niigata University
Bibliographic Information
- Other Title
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- 比率形質に関する切断型選抜における切断点
- Truncation Point in Truncation Selectio
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Abstract
Of ratio traits, there exists a trait whose numerator is also contained in the denominator as its one component. This type of trait may be called a proportion-defined trait or simply a proportion trait. In this paper, the truncation point for a proportion-defined trait is investigated, assuming that its component traits follow normality and have positive values and supposing a proportion of population selected truncatedly. A formula for the point is expressed in terms of phenotypic parameters such as coefficients of variation and correlation for component traits and the truncation value corresponding to a given proportion of population selected of the standard normal distribution. It is considered that the validity of the formula requires the fulfilled assumption of small coefficients of variation or curtailed normality for component traits. Using the formula and its approximation based on the assumption of normality, the discrepancy between the truncation value and the approximate value is evaluated deterministically. The degree of the discrepancy is shown to be affected by the values of phenotypic parameters, especially by the relative magnitude of coefficients of variation, for component traits. It is suggested that the geometric shape of the intrinsic distribution of the proportion trait is changeable: that is, symmetric, skewed to the right, or to the left.
Journal
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- Nihon Chikusan Gakkaiho
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Nihon Chikusan Gakkaiho 69 (5), 417-423, 1998
Japanese Society of Animal Science
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Keywords
Details 詳細情報について
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- CRID
- 1390282680172888960
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- NII Article ID
- 10021726047
- 10020395272
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- NII Book ID
- AN00195188
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- ISSN
- 18808255
- 00215309
- 1346907X
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- NDL BIB ID
- 4482258
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed