Estimation of genetic variance components and heritabilities for cut-flower yield in gerbera using least squares and maximum likelihood methods

Euphytica ◽  
1996 ◽  
Vol 88 (1) ◽  
pp. 55-60 ◽  
Author(s):  
James Harding ◽  
Hongzhan Huang ◽  
Thomas Byrne
Keyword(s):  
Maximum Likelihood ◽  
Least Squares ◽  
Variance Components ◽  
Genetic Variance ◽  
Cut Flower ◽  
Likelihood Methods ◽  
Flower Yield ◽  
Maximum Likelihood Methods ◽  
Cut Flower Yield

Genetic and environmental effects on milk yield of Pitangueiras cattle

1984 ◽  
Vol 39 (2) ◽  
pp. 157-163 ◽  
Author(s):  
R. B. Lôbo ◽  
F. A. M. Duarte ◽  
A. A. M. Gonçalves ◽  
J. A. Oliveira ◽  
C. J. Wilcox
Keyword(s):  
Maximum Likelihood ◽  
Least Squares ◽  
Milk Yield ◽  
Environmental Effects ◽  
Intraclass Correlation ◽  
Statistical Analyses ◽  
Likelihood Methods ◽  
Maximum Production ◽  
Lactation Length ◽  
Maximum Likelihood Methods

ABSTRACTData from 5270 lactation records of 1380 cows sired by 132 bulls and recorded from 1962 to 1977 were analysed. Statistical analyses, using least squares and maximum likelihood methods, showed significant effects for genetic group, age of cow, month and year of calving, and lactation length. Overall mean milk yield was 2780 kg (CV = 0·31) with mean lactation length of 281 days. Maximum production occurred in the fifth lactation (104 or 105 months of age at calving) with a yield of 1·3 times that of the first lactation. Repeatability estimated by intraclass correlation was 0·40 (s.e. 0·03). Heritability estimated from paternal half-sib correlation was 0·16 (s.e. 0·06). Overall results were very similar to those obtained from research with European breeds in temperate areas.

A comparison of least squares and maximum likelihood methods using sine fitting in ADC testing

Measurement ◽  
2013 ◽  
Vol 46 (10) ◽  
pp. 4362-4368 ◽  
Author(s):  
Ján Šaliga ◽  
István Kollár ◽  
Linus Michaeli ◽  
Ján Buša ◽  
Jozef Lipták ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Least Squares ◽  
Likelihood Methods ◽  
Maximum Likelihood Methods ◽  
Fitting In ◽  
Adc Testing

scholarly journals ESTIMATION OF VARIANCE COMPONENTS AND HERITABILITY FOR FLOWERING TIME AND CUT-FLOWER YIELD FOR THE DAVIS POPULATION OF GERBERA USING RESTRICTED MAXIMUM LIKELIHOOD (REML)

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1173d-1173
Author(s):  
Yiran Yu ◽  
James Harding ◽  
Thomas Famula
Keyword(s):  
Maximum Likelihood ◽  
Flowering Time ◽  
Restricted Maximum Likelihood ◽  
Cut Flower ◽  
Plant Populations ◽  
Components Of Variance ◽  
Genetic Components ◽  
Flower Yield ◽  
Cut Flower Yield ◽  
Estimation Of Variance

Additive genetic components of variance and narrow-sense heritabilities were estimated for flowering time and cut-flower yield for generations 8-13 of the Davis population of gerbera, using the least squares (LS) and restricted maximum likelihood (REML)methods. Estimates of heritability for flowering time were 0.54 and 0.50 using REML and LS, respectively, indicating a close agreement between the two methods. However, estimates of heritability for cut-flower yield were 0.30 and 0.46 from REML and LS. This may result from the fact that cut-flower yield was selected in each generation; flowering time was not. Realized heritability for cut-flower yield was estimated to be 0.26 which agreeded more closely with the heritability estimated from REML. The advantages of REML, and its applications in the estimation of components of genetic variance and heritability of plant populations are discussed.

INHERITANCE OF FLOWERING TIME AND ITS APPLICATION FOR INDIRECT SELECTION IN THE DAVIS POPULATION OF GERBERA

HortScience ◽  
1990 ◽  
Vol 25 (11) ◽  
pp. 1357F-1358
Author(s):  
Yiran Yu ◽  
James Harding ◽  
Thomas Byrne
Keyword(s):  
Flowering Time ◽  
Genetic Correlations ◽  
Indirect Selection ◽  
Cut Flower ◽  
Narrow Sense ◽  
Narrow Sense Heritability ◽  
Components Of Variance ◽  
Genetic Components ◽  
Flower Yield ◽  
Cut Flower Yield

Genetic components of variance and heritability of flowering time were estimated for five generations of the Davis Populationof Gerbera hybrids, Composite, Estimates of narrow-sense heritability averaged 0.50 and broad-sense heritability averaged 0.77 using the NCII design. Narrow-sense heritability was also estimated with two models of parent-offspring regression, resulting in average heritability of 0.49 and 0.51. Estimates of components of variance indicated that the major genetic effect controlling flowering time is additive. However, the dominance component accounted for 28% of the total variance; the environmental component was only 23%. Flowering time is negatively correlated with cut-flower yield. The phenotypic coefficient was –0.34; genetic correlations were –0.47 when estimated from the NCII design, and –0.72 when estimated from the parent-off-spring method. A practical model was constructed to assess the efficiency of indirect selection for cut-flower yield using flowering time as a marker trait. The advantages of indirect selection accruing from increased population size and reduced generation time are discussed.

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