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 Genetic gains under three methods of selection

1962 ◽  
Vol 3 (3) ◽  
pp. 417-423 ◽  
Author(s):  
D. J. Finney
Keyword(s):  
Linear Function ◽  
Genetic Gain ◽  
Index Selection ◽  
Genetic Gains ◽  
Independent Culling

Results obtained by Young for the expectation of genetic gain in an arbitrary linear function of several traits under selection by independent culling levels, under tandem selection, and under index selection have been obtained in slightly more general form and their dependence on basic genetic and phenotypic parameters exhibited. A warning is given about the effects of selection in modifying the distribution of traits; when the distribution has become appreciably non-normal, any calculation of genetic gains from formulae based on normality will tend to overestimation.

Experimental comparison of restricted selection index and restricted independent culling levels in Tribolium castaneum

Genome ◽  
1987 ◽  
Vol 29 (1) ◽  
pp. 91-96 ◽  
Author(s):  
J. L. Campo ◽  
B. Villanueva
Keyword(s):  
Tribolium Castaneum ◽  
Selection Index ◽  
Egg Laying ◽  
Experimental Comparison ◽  
Pupal Weight ◽  
Selection Methods ◽  
Adult Weight ◽  
Antagonistic Selection ◽  
Independent Culling ◽  
Restricted Selection

A selection index (I) method was compared with independent culling levels (N), with a restriction in the selection program, using two replicated single generation experiments in Tribolium castaneum, which are considered forms of antagonistic selection. The first experiment was designed to increase adult weight without changing pupal weight, while the second experiment was intended to improve egg laying without changing adult weight. In both experiments the genetic correlation between the traits involved were positive but were higher in experiment 1 than in experiment 2. The proportion of selection was 10%. In experiment 1, the effect of restriction was as expected in both lines since the changes in pupal weight were not significant. Adult weight change was positive for the I line and negative for the N line, showing that the index was a superior method to improve adult weight. In experiment 2, the effect of restriction was also as expected in both lines and changes in adult weight were not significant. Egg laying changed positively in both lines. Therefore, both selection methods were similar in this experiment, even though egg laying change was higher in the I than the N line. Key words: restricted index, restricted culling levels, antagonistic selection, Tribolium.

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