scholarly journals Individual selection for high whiteness pearled barley using colorimeter

2004 ◽  
Vol 6 (4) ◽  
pp. 229-232
Author(s):  
Takahide Baba ◽  
Emiko Nakamura ◽  
Keiko Hayashi ◽  
Seiji Ito
Keyword(s):  
Individual Selection ◽  
Selection For

Study of resistance and vitality responses in six silkworm (Bombyx mori L.) hybrids under individual selection for parental lines

2009 ◽  
Vol 2009 ◽  
pp. 130-130
Author(s):  
A Seidavi ◽  
S Z Mirhosseini ◽  
M Mavvajpour ◽  
A Bizhannia ◽  
M Ghanipoor
Keyword(s):  
Parental Line ◽  
Individual Selection ◽  
Industrial Workers ◽  
Hybrid Generation ◽  
Cocoon Production ◽  
Agricultural Industry ◽  
Selection Systems ◽  
Selection For ◽  
Resistance Performance ◽  
Silkworm Bombyx Mori

Sericulture has been an important agricultural industry since 2650 BC (Seidavi et al. 2006). There are about 10 million farmers and 0.5 million related industrial workers in the world. The present capacity of silkworm eggs production in Iran is about 70000 boxes per year which are distributed among 40000 silkworm house holders. Annual cocoon production in Iran is about 6000 metric tons which is small in comparison with production in previous centuries. Silkworm breeding using selection systems can improve line and hybrid performance. Individual selection based on cocoon weight in GGP generation (great grandparent) improved GP (grandparent) and P (parent) parental line generation (Seidavi et al. 2007), but it did not consider the effects on resistance performance of hybrid generation. In this experiment, the effects of two phenotypic selections of GGP parents on vitality (percentage of survival pupae) and resistance properties in six of their hybrids (including 31×32, 32×31, 103×104, 104×103, 107×110 and 110×107) were studied.

scholarly journals Two-way within-family and mass selection for 8-week body weight in different mouse populations

1984 ◽  
Vol 43 (2) ◽  
pp. 191-200 ◽  
Author(s):  
Ines von Butler ◽  
Henning Willeke ◽  
Franz Pirchner
Keyword(s):  
Body Weight ◽  
Inbred Strains ◽  
Selection Response ◽  
Mass Selection ◽  
Individual Selection ◽  
Family Selection ◽  
Body Weights ◽  
Selection For ◽  
Size At Birth ◽  
Better Than

SUMMARYTwo mouse populations, randombred albino mice and a cross of four inbred strains, were divergently selected for high (H8) and low (L8) 8-week body weight over 18 generations using within-family and individual selection. The crossbreds showed asymmetry of selection response and realized heritabilities (H8 0·29 ± 0·01; L8 0·17 ± 0·01). In the randombred population realized heritabilities were symmetrical (H8 0·23 ± 0·01; L8 0·22 ± 0·02). Over the first nine generations individual selection was nearly 40 per cent better than within-family selection, as was expected from the full sib correlation in both populations. As selection progressed, within-family selection reached 82% and 61% of the responses obtained with individual selection in the crossbreds and randombred respectively. Correlated responses for 3-week (weaning) and 5-week body weights agreed with observations made on direct responses, but selection for L8 did not reduce weaning weight. Selection for L8 decreased and selection for H8 increased first litter size at birth. However, mass-selected L8-pairs had a higher life-reproduction and life-span than H8-pairs.

Comparison of efficiency of alternative selection strategies: An example of selection for resistance to common scab in potatoes

1996 ◽  
Vol 76 (4) ◽  
pp. 849-852 ◽  
Author(s):  
G. C. C. Tai ◽  
A. Murphy ◽  
H. De Jong
Keyword(s):  
Confidence Intervals ◽  
Common Scab ◽  
Normal Approximation ◽  
Field Resistance ◽  
Approximation Procedure ◽  
Individual Selection ◽  
Response To Selection ◽  
Selection Strategies ◽  
Point Estimates ◽  
Selection For

This paper describes a procedure for obtaining point estimates and confidence intervals of response to different selection strategies based on results of analysis of variance. Three alternative selection strategies were compared: family, within-family, and individual selection. Experimental data on field resistance of potato seedlings to common scab were used to illustrate the procedure. The confidence intervals were then compared with the intervals established by a normal-approximation procedure. Key words: Common scab, confidence intervals, response to selection, Solanum tuberosum

scholarly journals Heritability estimates for body weight and height at withers in Brazilian army horses

2012 ◽  
Vol 42 (12) ◽  
pp. 2246-2251 ◽  
Author(s):  
Priscilla Regina Tamioso ◽  
Tiago Rafael Cosmo ◽  
Concepta Margaret McManus Pimentel ◽  
Laila Talarico Dias ◽  
Rodrigo de Almeida Teixeira
Keyword(s):  
Body Weight ◽  
Genetic Effects ◽  
Complete Data ◽  
The Other ◽  
Individual Selection ◽  
Age Classes ◽  
Linear Effect ◽  
Linear Effects ◽  
Selection For ◽  
Selection Of

The aim of this study was to estimate the heritability for weight and height at withers of 260-780 days of age No Defined Breed (NDB) horses, at intervals of 40 days, which belong to the Brazilian Army cavalry. Thus, the model considered the direct genetic effects as random ones, as fixed, the effects of sex and year of birth and the linear effects of height at withers and age, as covariates for the analysis of body weight, whereas for the analysis of height, the linear effect of weight was included as a covariate. For the complete data, the estimated heritability coefficients were 0.40±0.034 and 0.70±0.019 for weight and height at withers, respectively, indicating that individual selection for these traits may be effective. On the other hand, for the data subdivided into age classes, the heritability coefficients ranged between 0.04 and 0.77 for weight, with the highest estimation for the class between 440 and 480 days of age, which indicates a higher possibility of weight selection during this period. For height, the heritability values ranged between 0.08 and 0.98, being the highest estimate found between 300 and 340 days of age, corroborating, thus, to the selection of the trait at this age.

scholarly journals Ancient Egyptian Pottery from the Collection of Vladimir S. Golenischev at the Pushkin State Museum of Fine Arts: Individual Selection for a Representative Exposition

2021 ◽  
pp. 61
Author(s):  
Svetlana E. Malykh
Keyword(s):  
Morphological Evolution ◽  
Fine Arts ◽  
Individual Selection ◽  
Ancient Egyptian ◽  
State Museum ◽  
Foreign Influence ◽  
Ceramic Vessels ◽  
Selection For ◽  
Museum Of Fine Arts

The article describes the collection of ancient Egyptian ceramic vessels, collected by the famous Russian Egyptologist Vladimir S. Golenischev and now preserved in the Pushkin State Museum of Fine Arts in Moscow. Despite its relatively small size (about 100 samples), the collection is highly representative: It illustrates Egyptian pottery from the early Predynastic Period (Naqada I, 4000–3600 B.C.) to the Arab conquest of Egypt in 641 A.D. and allows to study various aspects of the pottery manufacturing, morphological evolution, features of decor, artistic preferences and foreign influence on this type of craft.

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