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The effect of different selection intensities on selection response in egg-laying of Tribolium castaneum

Published online by Cambridge University Press:  14 April 2009

R. G. Ruano ,
F. Orozco  and
C. López-Fanjul
R. G. Ruano
Affiliation:
Departamento de Genética, Instituto National de Investigationes Agrarias, Avda. Puerta de Hierro s/n, Madrid – 3, Spain
F. Orozco
Affiliation:
Departamento de Genética, Instituto National de Investigationes Agrarias, Avda. Puerta de Hierro s/n, Madrid – 3, Spain
C. López-Fanjul
Affiliation:
Departamento de Genética, Instituto National de Investigationes Agrarias, Avda. Puerta de Hierro s/n, Madrid – 3, Spain
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An experiment was carried out to test the effect of varying selection intensity on the response to individual selection with a fixed number of individuals scored per generation. The selected trait was egg laying of virgin females of Tribolium castaneum scored from the 7th to the 1 lth day after adult emergence. Five different selected proportions of females were considered (5, 10, 20, 33 and 50%) and each treatment was represented by two replicate lines. Control lines were maintained throughout the experiment. The lines selected at the lowest proportions (5 and 10%) led to the largest initial gains, but the largest final gains were achieved, by the lines where the proportions selected were 10 and 20%, in agreement with theory. Lines where the proportion selected was 50% gave the lowest rate of response over the period considered (32 generations). A good agreement was found between predicted and realized short-term responses to selection. Prediction at later stages of selection deteriorated in the most strongly selected lines mainly due to the levels of inbreeding attained.

Type
Research Article
Information
Genetics Research , Volume 25 , Issue 1 , February 1975 , pp. 17 - 27
Copyright
Copyright © Cambridge University Press 1975

References

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