scholarly journals Correlated responses to long-term selection for clutch length in dwarf brown-egg layers carrying or not carrying the naked neck gene

2003 ◽  
Vol 82 (5) ◽  
pp. 709-720 ◽  
Author(s):  
CF Chen ◽  
M Tixier-Boichard
Keyword(s):  
Correlated Responses ◽  
Naked Neck ◽  
Term Selection ◽  
Selection For ◽  
Naked Neck Gene

Correlated responses in lamb mortality due to long term selection for cannon bone length and fleece medullation in sheep

1983 ◽  
Vol 37 (2) ◽  
pp. 293-299 ◽  
Author(s):  
R. I. Cue
Keyword(s):  
Maximum Likelihood ◽  
Correlated Responses ◽  
Sheep Flock ◽  
Term Selection ◽  
Bone Length ◽  
Selection For

ABSTRACTLamb mortality in a Scottish Blackface hill sheep flock subjected to long term selection for cannon bone length and fleece medullation score was investigated, using maximum likelihood analyses. The selection for cannon bone length and for medullation score had no significant effect on lamb mortality.

scholarly journals Correlated Responses of Different scute Genotypes to Long-term Selection for Increased Abdominal Bristle Number in Drosophila melanogaster

1974 ◽  
Vol 27 (2) ◽  
pp. 205 ◽  
Author(s):  
BH Yoo
Keyword(s):  
Genetic Background ◽  
Gene Action ◽  
Regression Coefficient ◽  
Dose Effect ◽  
Base Population ◽  
Correlated Responses ◽  
Term Selection ◽  
Bristle Number ◽  
Selection For

The first dose effect of sc+ has been measured for abdominal bristle number in six replicate lines of D. melanogaster being selected upward for this character in the sc homo-and hemizygote. The within-line regression coefficient of the heterozygote on the sc homozygote showed considerable variation among the lines with a range of 0-47-1' 22, indicating the dependence of gene action on genetic background. But, on the average, the effect of sc+ was approximately additive for abdominal bristle number. From this average, the genetic correlation in the base population between the two genotypes was estimated to be considerably less than unity, which suggests some genetic variability that is dependent on the genotype of the major locus. A similar relationship was also obtained for the two male hemizygotes.

Factors affecting direct and correlated responses in a White Leghorn population under long term selection for egg number

1998 ◽  
Vol 39 (1) ◽  
pp. 31-38 ◽  
Author(s):  
D. SHARMA ◽  
D.C. JOHARI ◽  
M.C. KATARIA ◽  
R.C. HAZARY ◽  
D. CHOUDHARI ◽  
...  
Keyword(s):  
White Leghorn ◽  
Correlated Responses ◽  
Factors Affecting ◽  
Term Selection ◽  
Egg Number ◽  
Selection For

scholarly journals Direct and Correlated Responses to Long-Term Selection for Increased Body Weight and Egg Production in Turkeys

1996 ◽  
Vol 75 (10) ◽  
pp. 1180-1191 ◽  
Author(s):  
KARL E. NESTOR ◽  
D.O. NOBLE ◽  
J. ZHU ◽  
Y. MORITSU
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Correlated Responses ◽  
Term Selection ◽  
Selection For

scholarly journals Studies on the Scutellar Bristles of Drosophila Melanogaster ID. Long-Term Selection for High Bristle Number in Three further Lines Derived From the Oregon-RC Strain, Correlated Responses in Abdominal Bristles, lUld Changes in Regulation of the Scute Locu

1981 ◽  
Vol 34 (3) ◽  
pp. 347
Author(s):  
BL Sheldon ◽  
M K Evanst
Keyword(s):  
Sex Differences ◽  
Drosophila Melanogaster ◽  
Correlated Response ◽  
Correlated Responses ◽  
Term Selection ◽  
Bristle Number ◽  
Selection For

Results of selection over 135 generations for high scutellar bristle number in three further lines derived from Oregon-RC complement those on the four lines reported previously (Sheldon and Milton 1972). All lines differed widely in pattern of scutellar response, correlated response in abdominal and posterior central scutellar bristles, sex differences, and behaviour on relaxing selection, though the selection limits reached in the present three lines were lower than in the previous lines.

scholarly journals Optimum selection intensities in artificial selection programmes: an experimental evaluation

1977 ◽  
Vol 30 (2) ◽  
pp. 115-119 ◽  
Author(s):  
R. Frankham
Keyword(s):  
Experimental Evaluation ◽  
Selection Intensity ◽  
Effective Population ◽  
Term Selection ◽  
Optimum Selection ◽  
Selection For ◽  
Selection Intensities ◽  
Selection Of ◽  
Better Than

SUMMARYAn experimental evaluation of Robertson's (1970) theory concerning optimum intensities of selection for selection of varying durations has been carried out using published results from a long term selection study in Drosophila. Agreement of predicted rankings of treatments with expectations was excellent for low values of t/T (generations/total number scored) but poor for larger values of t/T. This was due to the 20% selection intensity treatments responding worse than expected and the 40% treatments relatively better than expected. Several possible reasons for the discrepancies exist but the most likely explanation is considered to be the greater reduction in effective population size due to selection in treatments with more intense selection.

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