An approximate method for optimum independent culling level selection for n stages of selection with explicit solutions

1991 ◽  
Vol 82 (4) ◽  
pp. 457-465
Author(s):  
W. M. Muir ◽  
Shizhong Xu
Keyword(s):  
Approximate Method ◽  
Explicit Solutions ◽  
Independent Culling ◽  
Selection For ◽  
Culling Level

Optimal Truncation Points for Independent Culling-Level Selection Involving Two Traits

Biometrics ◽  
1982 ◽  
Vol 38 (4) ◽  
pp. 975 ◽  
Author(s):  
S. P. Smith ◽  
R. L. Quaas
Keyword(s):  
Independent Culling ◽  
Culling Level

scholarly journals 83 PENINGKATAN DAYA HASIL DAN STAY-GREEN TANAMAN JAGUNG MELALUI SELEKSI TANDEM DAN INDEPENDENT CULLING LEVEL DI LAHAN KERING

2020 ◽  
Vol 29 (1) ◽  
pp. 9
Author(s):  
I Wayan Sudika ◽  
Muliarta A ◽  
Sudharmawan Sudharmawan ◽  
Dwi Ratna ◽  
Idris Idris
Keyword(s):  
Block Design ◽  
Yield Potential ◽  
Base Population ◽  
Stay Green ◽  
Dry Land ◽  
Significance Level ◽  
Fresh Biomass ◽  
Randomized Block Design ◽  
Independent Culling ◽  
Culling Level

ABSTRAK Tujuan penelitian adalah untuk mengetahui kemajuan seleksi tandem dan independent culling level selama tiga siklus di lahan kering dan mengetahui rerata daya hasil dan stay-green (brangkasan segar) populasi hasil seleksi dibanding dengan populasi awal dan varietas unggul Lamuru. Percobaan dirancang dengan rancangan acak kelompok, 3 blok di lahan kering Lombok Utara. Data dianalisa dengan analisis sidik ragam pada taraf nyata 5 persen. Rata-rata kemajuan seleksi per siklus setiap cara, diperoleh dari koefisien regresi antara karakter dengan siklus seleksi (populasi). Rerata perlakuan, diuji lanjut dengan BNT0,05. Hasil penelitian menunjukkan, bahwa kemajuan seleksi per siklus kedua cara hingga siklus ketiga untuk daya hasil dan brangkasan segar bersifat linear yang nyata. Besarnya kemajuan seleksi per siklus daya hasil secara tandem dan independent culling level berturut-turut 2,19 dan 2,74 g/tan; sedangkan untuk brangkasan segar sebesar 6,86 dan 13,77 g/tan. Rerata daya hasil dan bobot brangkasan segar, populasi hasil seleksi siklus ketiga kedua cara lebih besar dibanding  populasi awal. Daya hasil populasi hasil seleksi independent culling level siklus ketiga lebih besar dibanding varietas Lamuru; namun populasi hasil seleksi tandem sama. ABSTRACT             The objective of this research was to determine the progress of tandem and independent culling level selections until the three cycles on dry land and determine the mean grain yield and stay - green of selected plant populations compared with the base population and Lamuru superior variety. The experiment was designed using randomized block design with 3 replicates in North Lombok dry land.  The observed data were analyzed using analysis of variance and LSD at the 5 percent significance level. The average of selection progress per cycle each way was obtained from the regression coefficient between the observed characters and the selection cycle (population). The results of the research showed that the progress of selection per cycle until the third cycle for yield (dry grain seed weight) and fresh biomass for both ways were significant linear. The selection progress of yield potential for tandem selection and independent culling level  were 2,19 dan 2,74 g/tan respectivelly. The selection progress of biomass weight were 6,86 dan 13,77 g/tan for tandem selection and independent culling level. Mean of yield potential and fresh biomass weight for two ways were higher base population. Yield  population  of independent culling level selection three cycles were higher than Lamuru variety; but population result of tandem selection as the same.

scholarly journals Effects of selection for independent changes in two highly correlated body weight traits of mice

1977 ◽  
Vol 29 (2) ◽  
pp. 133-145 ◽  
Author(s):  
J. C. McCarthy ◽  
D. P. Doolittle
Keyword(s):  
Body Weight ◽  
Response Selection ◽  
The Other ◽  
Index Selection ◽  
Correlated Responses ◽  
Body Weights ◽  
Independent Culling ◽  
Selection For ◽  
Highly Correlated

SUMMARYMice were selected for high and low body weight at 5 and at 10 weeks of age. Selection was performed (1) separately for each trait, and (2) for various combinations of the two traits, using (a) independent culling levels and (b) restricted indices. Two-way selection for each trait separately gave large responses and correlated responses. Selection by independent culling levels intended to increase 5-week weight while restricting change in 10-week weight gave no demonstrable response; selection by culling levels intended to decrease 5-week weight while restricting change in 10-week weight resulted in decreases in body weights at both ages. Index selection, intended to change weight at one age while holding that at the other age constant, was generally successful. Observed responses did not conform very well with predicted responses for either index or culling levels selection. The significance of these observations in regard to the problem of selection involving restriction of traits is discussed.

scholarly journals Two-trait Selection and the Genetic Correlation II. Changes in the Genetic Correlation During Two-trait Selection

1974 ◽  
Vol 27 (1) ◽  
pp. 89 ◽  
Author(s):  
AK Sheridan ◽  
JSF Barker
Keyword(s):  
Genetic Correlation ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Experimental Information ◽  
Base Population ◽  
Negative Change ◽  
Quantitative Characters ◽  
Bristle Number ◽  
Independent Culling ◽  
Selection For

Although there is little experimental information on the effect of simultaneous selection for two quantitative characters on the magnitude of the genetic correlation between them, it is apparently generally expected that such selection for the two characters in the same direction will cause a negative change in the genetic correlation, and selection in opposite directions a positive change. Selection using independent culling levels was done for each of the four combinations of high or low third coxal bristle number with high or low sternopleural bristle number in Drosophila melanogaster for 22 generations. To estimate changes in the genetic correlation, realized genetic parameters were estimated from single-trait lines started from the base population, and from the two-trait lines after 10 and 22 generations of selection. Changes in the genetic correlation in individual two-trait selection lines were variable and unpredictable. At generation 22 concurrent two-trait selection had resulted in significantly larger realized genetic correlations than divergent two-trait selection, so that results were contrary to the generally accepted expectation.

Selection of extremes

1972 ◽  
Vol 14 (1) ◽  
pp. 11-15 ◽  
Author(s):  
Hans Abplanalp
Keyword(s):  
Selection For ◽  
Selection Intensities ◽  
Efficiency Of Selection ◽  
Culling Level ◽  
Selection Of

SUMMARYA method of selection for two or more traits is investigated, where the selected individuals have to be the highest performing for any one trait, but not necessarily for several traits. The efficiency of selection of extremes is contrasted with the methods of culling levels and tandem selection. It is shown to be superior to culling level selection when the proportion of individuals retained for breeding exceeds 0·5. At higher selection intensities, the effectiveness of selection of extremes falls between that of culling levels and tandem selection.

scholarly journals Optimal Smooth Portfolio Selection for an Insider

2007 ◽  
Vol 44 (3) ◽  
pp. 742-752 ◽  
Author(s):  
Yaozhong Hu ◽  
Bernt Øksendal
Keyword(s):  
Portfolio Selection ◽  
Stochastic Calculus ◽  
Optimal Portfolio ◽  
Explicit Solutions ◽  
Terminal Wealth ◽  
Portfolio Problem ◽  
Selection For

We study the optimal portfolio problem for an insider, in the case where the performance is measured in terms of the logarithm of the terminal wealth minus a term measuring the roughness and the growth of the portfolio. We give explicit solutions in some cases. Our method uses stochastic calculus of forward integrals.

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